diff --git a/README.md b/README.md
index 919860a..6680d2b 100644
--- a/README.md
+++ b/README.md
@@ -160,6 +160,38 @@ This node features a sophisticated system for managing performance, memory, and
 ## Changelog
 
 <details open>
+<summary><strong>v2.1.1 - Standard ComfyUI Progress Bar During Inference</strong></summary>
+
+### ✨ Highlights
+*   **Live progress bar:** All three nodes (TTS, Realtime TTS, ASR) now drive the standard
+    ComfyUI frontend progress bar during inference. Previously the bar sat at 0% for the whole
+    generation and jumped to 100% only at the end.
+*   **Responsive cancel:** the progress hook checks ComfyUI's interrupt flag on every loop step,
+    so pressing cancel stops generation promptly instead of waiting for the current blocking call.
+*   **Guaranteed 100%:** a final progress event is always emitted, even when generation stops
+    early (EOS) or raises.
+
+### 🔧 Changes
+*   Vendored `generate()` (non-streaming + streaming) gained an optional, framework-agnostic
+    `progress_callback(current, total)` hook fired once per AR loop step (vendored code stays
+    `comfy`-free; `None` = disabled, fully backward compatible).
+*   `modules/generation.py`: `generate_audio()` / `generate_streaming_audio()` wrap the hook with
+    `comfy.utils.ProgressBar` (throttled WebSocket updates; the bar total self-corrects via
+    `update_absolute(value, total=...)` once the loop reports its real budget).
+*   `modules/asr_generation.py`: ASR reports per-token progress through an HF `BaseStreamer`
+    (greedy/sampling only; beam search falls back to a single 0→100% bar).
+
+### 🧪 Tests
+*   New `tests/test_generate_progress_callback.py` (5 tests) and
+    `tests/test_streaming_progress_callback.py` (4 tests): drive the real vendored loops with
+    scripted mocks and lock the callback contract (monotonic, bounded, call counts, interrupt
+    propagation, output determinism).
+*   New `tests/test_streaming_progress.py` (4 tests); extended `tests/test_generation.py` (+5),
+    `tests/test_asr_generation.py` (+6), `tests/test_integration.py` (+3 node-level tests).
+
+</details>
+
+<details>
 <summary><strong>v2.1.0 - torchaudio-Primary Audio Backend (librosa now optional)</strong></summary>
 
 ### ✨ Highlights
diff --git a/modules/asr_generation.py b/modules/asr_generation.py
index 7e5e664..67422f2 100644
--- a/modules/asr_generation.py
+++ b/modules/asr_generation.py
@@ -12,6 +12,8 @@ import logging
 from typing import Optional, Tuple, List, Dict, Any
 
 import comfy.model_management as model_management
+from comfy.utils import ProgressBar
+from transformers.generation import BaseStreamer
 
 from .asr_loader import VibeVoiceASRLoader, VibeVoiceASRModelHandler, LOADED_ASR_MODELS_CACHE, cleanup_asr_models
 from .patcher import VibeVoiceASRPatcher
@@ -24,6 +26,40 @@ from .attention_utils import resolve_attention_mode
 logger = logging.getLogger(__name__)
 
 
+class _ASRProgressStreamer(BaseStreamer):
+    """Token streamer that drives the standard ComfyUI progress bar during ASR.
+
+    HF ``GenerationMixin`` calls ``put(next_tokens)`` once per generated token
+    (prompt tokens are NOT streamed). Each call advances the bar by the number
+    of tokens in the batch and checks for user interruption, so cancelling an
+    ASR transcription becomes responsive. ``end()`` sends the final 100% event.
+
+    Only attached for greedy/sampling decoding (``num_beams <= 1``); beam
+    search is not compatible with a plain token streamer and falls back to a
+    single 0->100% bar.
+    """
+
+    def __init__(self, pbar: "ProgressBar", total: int):
+        self.pbar = pbar
+        self.total = max(1, int(total))
+        self.count = 0
+
+    def put(self, value):
+        # Responsive cancellation (raises InterruptProcessingException).
+        model_management.throw_exception_if_processing_interrupted()
+        if isinstance(value, torch.Tensor):
+            n = int(value.numel())
+        elif isinstance(value, (list, tuple)):
+            n = len(value)
+        else:
+            n = 1
+        self.count = min(self.count + n, self.total)
+        self.pbar.update_absolute(self.count, total=self.total)
+
+    def end(self):
+        self.pbar.update_absolute(self.total)
+
+
 def load_asr_model(
     model_name: str,
     device: str = "auto",
@@ -226,11 +262,19 @@ def transcribe_audio(
     # Remove None values
     generation_config = {k: v for k, v in generation_config.items() if v is not None}
 
+    # Standard ComfyUI progress bar. HF generate() reports per-token progress
+    # through a streamer (greedy/sampling only; beam search falls back to a
+    # single 0->100% bar because plain token streamers are beam-incompatible).
+    pbar = ProgressBar(max_new_tokens)
+    use_streamer = generation_config.get("num_beams", 1) <= 1
+    streamer = _ASRProgressStreamer(pbar, total=max_new_tokens) if use_streamer else None
+
     try:
         with torch.no_grad():
             output_ids = model.generate(
                 **inputs,
                 **generation_config,
+                **({"streamer": streamer} if streamer is not None else {}),
             )
 
         # Decode output (exclude input tokens)
@@ -264,6 +308,10 @@ def transcribe_audio(
     except Exception as e:
         logger.error(f"ASR transcription failed: {e}")
         raise RuntimeError(f"Transcription failed: {e}")
+    finally:
+        # Guarantee the final 100% event even when generation stopped early
+        # (EOS before max_new_tokens) or raised.
+        pbar.update_absolute(pbar.total)
 
 
 def force_offload_asr_model(model_name: str, patcher=None) -> None:
diff --git a/modules/generation.py b/modules/generation.py
index 20a32ba..5488690 100644
--- a/modules/generation.py
+++ b/modules/generation.py
@@ -237,17 +237,28 @@ def generate_audio(
 
     # Generate
     with torch.no_grad():
+        # Standard ComfyUI progress bar. The initial total is only an estimate
+        # (diffusion steps); the vendored AR loop reports its real budget
+        # (max_steps) through `progress_callback`, and `update_absolute(value,
+        # total=...)` re-sets the bar's total dynamically on the first callback.
         pbar = ProgressBar(inference_steps)
 
+        def _progress(current: int, total: int) -> None:
+            # Responsive cancellation: raises InterruptProcessingException when
+            # the user pressed cancel (checked once per AR step).
+            model_management.throw_exception_if_processing_interrupted()
+            pbar.update_absolute(current, total=total)
+
         try:
-            outputs = model.generate(**gen_inputs)
-            pbar.update(inference_steps - pbar.current)
+            outputs = model.generate(**gen_inputs, progress_callback=_progress)
 
         except model_management.InterruptProcessingException:
             logger.info("VibeVoice generation interrupted by user")
             raise
         finally:
-            pbar.update_absolute(inference_steps)
+            # Guarantee the final 100% event even when the AR loop stopped
+            # early (EOS before max_steps) or generation raised.
+            pbar.update_absolute(pbar.total)
 
     # Post-process output
     output_waveform = outputs.speech_outputs[0]
@@ -419,7 +430,27 @@ def generate_streaming_audio(
         gen_kwargs["return_speech"] = True
 
     with torch.no_grad():
-        outputs = model.generate(**gen_kwargs)
+        # Standard ComfyUI progress bar. The streaming loop's real total
+        # (tts_lm max_length) is only known inside the vendored generate();
+        # the initial total=1 placeholder is corrected on the first callback
+        # via update_absolute(value, total=...).
+        pbar = ProgressBar(1)
+
+        def _progress(current: int, total: int) -> None:
+            # Responsive cancellation: raises InterruptProcessingException when
+            # the user pressed cancel (checked once per loop step).
+            model_management.throw_exception_if_processing_interrupted()
+            pbar.update_absolute(current, total=total)
+
+        try:
+            outputs = model.generate(**gen_kwargs, progress_callback=_progress)
+        except model_management.InterruptProcessingException:
+            logger.info("VibeVoice streaming generation interrupted by user")
+            raise
+        finally:
+            # Guarantee the final 100% event even when the loop stopped early
+            # (EOS classifier) or generation raised.
+            pbar.update_absolute(pbar.total)
 
     speech_outputs = outputs.speech_outputs
     if not speech_outputs or speech_outputs[0] is None:
diff --git a/pyproject.toml b/pyproject.toml
index 554eacd..d084f0f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [project]
 name = "ComfyUI-VibeVoice"
 description = "VibeVoice TTS. Expressive, long-form, multi-speaker conversational audio"
-version = "2.1.0"
+version = "2.1.1"
 license = {file = "LICENSE"}
 requires-python = ">=3.10"
 dependencies = ["torch", "torchaudio", "numpy", "huggingface_hub", "einops", "tokenizers", "soundfile", "s3tokenizer", "tqdm", "conformer", "safetensors", "transformers>=4.51.3", "diffusers", "bitsandbytes"]
diff --git a/src/vibevoice/modular/modeling_vibevoice.py b/src/vibevoice/modular/modeling_vibevoice.py
index 9eb53ed..9498661 100644
--- a/src/vibevoice/modular/modeling_vibevoice.py
+++ b/src/vibevoice/modular/modeling_vibevoice.py
@@ -705,6 +705,7 @@ class VibeVoiceForConditionalGeneration(VibeVoicePreTrainedModel):
         top_p: float = 0.95,
         top_k: int = 0,
         tokenizer: Optional[Any] = None,
+        progress_callback: Optional[Callable[[int, int], None]] = None,
         **kwargs,
     ) -> "VibeVoiceGenerationOutput":
         """Non-streaming text-to-speech generation (faithful original-protocol port).
@@ -752,6 +753,13 @@ class VibeVoiceForConditionalGeneration(VibeVoicePreTrainedModel):
                 are accepted for interface compatibility but unused -- the original
                 protocol samples with a constrained softmax (multinomial) or argmax.
             tokenizer: processor tokenizer; supplies the speech control-token ids.
+            progress_callback: Optional framework-agnostic hook invoked as
+                ``progress_callback(current, total)`` — once with ``(0, max_steps)``
+                before the AR loop and once after each completed AR step with
+                ``(step, max_steps)``. ``current`` is monotonic non-decreasing and
+                bounded by ``total``. ``None`` disables reporting. The callback may
+                raise to interrupt generation (the exception propagates out of
+                ``generate()``); callers use this for progress UI and cancellation.
 
         Returns:
             VibeVoiceGenerationOutput with ``sequences`` (input ids) and
@@ -828,6 +836,10 @@ class VibeVoiceForConditionalGeneration(VibeVoicePreTrainedModel):
         max_length_times = int(kwargs.get("max_length_times", 2))
         max_steps = max(1, min(max_new_tokens, int(max_length_times * seq_len)))
 
+        # Progress reporting: announce the loop budget before the first step.
+        if progress_callback is not None:
+            progress_callback(0, max_steps)
+
         # Diffusion steps.
         num_steps = inference_steps or getattr(
             self, "ddpm_inference_steps", self.config.diffusion_head_config.ddpm_num_inference_steps
@@ -1042,6 +1054,10 @@ class VibeVoiceForConditionalGeneration(VibeVoicePreTrainedModel):
                 break
             step += 1
 
+            # Progress reporting: one callback per completed AR step.
+            if progress_callback is not None:
+                progress_callback(step, max_steps)
+
         # ------------------------------------------------------------------
         # Assemble the per-sample waveform(s).
         # ------------------------------------------------------------------
diff --git a/src/vibevoice/modular/modeling_vibevoice_streaming_inference.py b/src/vibevoice/modular/modeling_vibevoice_streaming_inference.py
index da9d0b2..e6aa7ff 100644
--- a/src/vibevoice/modular/modeling_vibevoice_streaming_inference.py
+++ b/src/vibevoice/modular/modeling_vibevoice_streaming_inference.py
@@ -593,6 +593,7 @@ class VibeVoiceStreamingForConditionalGenerationInference(VibeVoiceStreamingPreT
         return_speech: bool = True,
         cfg_scale: float = 1.0,
         stop_check_fn: Optional[Callable[[], bool]] = None,
+        progress_callback: Optional[Callable[[int, int], None]] = None,
         **kwargs,
     ) -> Union[torch.LongTensor, VibeVoiceGenerationOutput]:
         """
@@ -610,6 +611,15 @@ class VibeVoiceStreamingForConditionalGenerationInference(VibeVoiceStreamingPreT
             cfg_scale: Classifier-free guidance scale for speech diffusion.
             return_speech: If False, skips audio decode concatenation.
             stop_check_fn: External early-stop hook (returns True to halt).
+            progress_callback: Optional framework-agnostic hook invoked as
+                ``progress_callback(current, total)`` after each text-window
+                prefill and after each generated speech token, where
+                ``total == tts_lm_generation_config.max_length``. ``current``
+                is monotonic non-decreasing and bounded by ``total``. ``None``
+                disables reporting. The callback may raise to interrupt
+                generation (the exception propagates out of ``generate()``);
+                callers use this for progress UI and cancellation. Orthogonal
+                to the console ``tqdm`` bar (``show_progress_bar``).
 
         Returns:
             VibeVoiceGenerationOutput with:
@@ -748,6 +758,9 @@ class VibeVoiceStreamingForConditionalGenerationInference(VibeVoiceStreamingPreT
                 if progress_bar is not None:
                     progress_bar.update(cur_input_tts_text_ids.shape[1])
                     progress_bar.set_description(f"Prefilled {total_prefilled_text_tokens} text tokens, generated {total_generated_speech_tokens} speech tokens, current step ({step} / {tts_lm_generation_config.max_length})")
+                # Framework-agnostic progress hook (ComfyUI progress bar).
+                if progress_callback is not None:
+                    progress_callback(step, tts_lm_generation_config.max_length)
 
                 model_inputs = self.prepare_inputs_for_generation(input_ids, **model_kwargs)
                 # Forward pass through the model
@@ -815,6 +828,9 @@ class VibeVoiceStreamingForConditionalGenerationInference(VibeVoiceStreamingPreT
                 if progress_bar is not None:
                     progress_bar.update(1)
                     progress_bar.set_description(f"Prefilled {total_prefilled_text_tokens} text tokens, generated {total_generated_speech_tokens} speech tokens, current step ({step} / {tts_lm_generation_config.max_length})")
+                # Framework-agnostic progress hook (ComfyUI progress bar).
+                if progress_callback is not None:
+                    progress_callback(step, tts_lm_generation_config.max_length)
 
                 tts_lm_model_inputs = self.prepare_inputs_for_generation(tts_lm_input_ids, **tts_lm_model_kwargs)
                 tts_lm_additional_inputs = {
diff --git a/tests/test_asr_generation.py b/tests/test_asr_generation.py
index 9ada8fe..be80432 100644
--- a/tests/test_asr_generation.py
+++ b/tests/test_asr_generation.py
@@ -300,3 +300,108 @@ class TestForceOffloadASRPatcher:
 
         LOADED_ASR_MODELS_CACHE.clear()
         VIBEVOICE_ASR_PATCHER_CACHE.clear()
+
+
+class TestASRProgressReporting:
+    """Phase 5 (2026-08-15 progress plan): ASR transcription must drive the
+    standard ComfyUI ProgressBar through an HF token streamer."""
+
+    @staticmethod
+    def _make_mocks():
+        mock_model = MagicMock()
+        mock_param = MagicMock()
+        mock_param.device = torch.device("cpu")
+        mock_model.parameters.return_value = iter([mock_param])
+        mock_output = torch.tensor([[1, 2, 3, 4, 5, 0]])
+        mock_model.generate.return_value = mock_output
+
+        mock_processor = MagicMock()
+        mock_processor.return_value = {"input_ids": torch.tensor([[1, 2, 3]])}
+        mock_processor.pad_id = 0
+        mock_processor.tokenizer.eos_token_id = 0
+        mock_processor.decode.return_value = "Hello world"
+        mock_processor.post_process_transcription.return_value = []
+        return mock_model, mock_processor
+
+    def _transcribe(self, mock_model, mock_processor, **kwargs):
+        with patch("ComfyUI_VibeVoice.modules.asr_generation.extract_audio_tensor") as mock_extract, \
+             patch("ComfyUI_VibeVoice.modules.asr_generation.ProgressBar") as mock_pbar_cls, \
+             patch("ComfyUI_VibeVoice.modules.asr_generation.model_management.throw_exception_if_processing_interrupted") as mock_interrupt:
+            mock_extract.return_value = (torch.randn(24000), 24000)
+            mock_pbar = MagicMock()
+            mock_pbar.total = kwargs.get("max_new_tokens", 32768)
+            mock_pbar_cls.return_value = mock_pbar
+
+            result = transcribe_audio(
+                model=mock_model,
+                processor=mock_processor,
+                audio_input={"waveform": torch.randn(1, 1, 24000), "sample_rate": 24000},
+                **kwargs,
+            )
+            return result, mock_model, mock_pbar_cls, mock_pbar, mock_interrupt
+
+    def test_streamer_put_advances_progress(self):
+        """T5.1: streamer.put() of a 2-token tensor advances the bar to 2."""
+        from ComfyUI_VibeVoice.modules.asr_generation import _ASRProgressStreamer
+
+        mock_pbar = MagicMock()
+        streamer = _ASRProgressStreamer(mock_pbar, total=100)
+        streamer.put(torch.tensor([[7, 8]]))
+
+        assert streamer.count == 2
+        mock_pbar.update_absolute.assert_called_once_with(2, total=100)
+
+    def test_streamer_end_sends_final_total(self):
+        """T5.2: streamer.end() sends the final total update."""
+        from ComfyUI_VibeVoice.modules.asr_generation import _ASRProgressStreamer
+
+        mock_pbar = MagicMock()
+        streamer = _ASRProgressStreamer(mock_pbar, total=50)
+        streamer.end()
+        mock_pbar.update_absolute.assert_called_once_with(50)
+
+    def test_generate_receives_streamer_for_sampling(self):
+        """T5.3a: model.generate receives streamer= when num_beams == 1."""
+        mock_model, mock_processor = self._make_mocks()
+        _, mock_model, _, _, _ = self._transcribe(mock_model, mock_processor, num_beams=1)
+
+        gen_kwargs = mock_model.generate.call_args.kwargs
+        assert "streamer" in gen_kwargs
+        assert gen_kwargs["streamer"] is not None
+
+    def test_generate_no_streamer_for_beam_search(self):
+        """T5.3b: model.generate must NOT receive streamer= when num_beams > 1."""
+        mock_model, mock_processor = self._make_mocks()
+        _, mock_model, _, _, _ = self._transcribe(mock_model, mock_processor, num_beams=4)
+
+        gen_kwargs = mock_model.generate.call_args.kwargs
+        assert "streamer" not in gen_kwargs
+
+    def test_streamer_put_checks_interrupt(self):
+        """T5.4: put() calls throw_exception_if_processing_interrupted; a raised
+        interrupt propagates."""
+        import comfy.model_management as mm
+        from ComfyUI_VibeVoice.modules.asr_generation import _ASRProgressStreamer
+
+        with patch("ComfyUI_VibeVoice.modules.asr_generation.model_management.throw_exception_if_processing_interrupted") as mock_interrupt:
+            mock_interrupt.side_effect = mm.InterruptProcessingException()
+            mock_pbar = MagicMock()
+            streamer = _ASRProgressStreamer(mock_pbar, total=100)
+
+            with pytest.raises(mm.InterruptProcessingException):
+                streamer.put(torch.tensor([7]))
+            mock_interrupt.assert_called()
+
+    def test_transcription_output_unchanged_with_progress(self):
+        """T5.5: progress plumbing must not change the transcription output."""
+        mock_model, mock_processor = self._make_mocks()
+        (raw_text, segments), _, mock_pbar_cls, mock_pbar, _ = self._transcribe(
+            mock_model, mock_processor, max_new_tokens=100
+        )
+
+        assert raw_text == "Hello world"
+        assert segments == []
+        # Bar created with the max_new_tokens budget and driven to 100% at the end.
+        mock_pbar_cls.assert_called_once_with(100)
+        final_call = mock_pbar.update_absolute.call_args_list[-1]
+        assert final_call.args == (100,)
diff --git a/tests/test_generate_progress_callback.py b/tests/test_generate_progress_callback.py
new file mode 100644
index 0000000..0acd8e0
--- /dev/null
+++ b/tests/test_generate_progress_callback.py
@@ -0,0 +1,319 @@
+"""Tests for the ``progress_callback`` hook in the non-streaming
+``VibeVoiceForConditionalGeneration.generate()`` (Phase 1 of the
+2026-08-15 inference-progress-reporting plan).
+
+The real vendored module is loaded with the same stub-diffusers /
+real-module pattern used by ``tests/test_model_forward.py``. A fully
+scripted mock inner model drives the AR loop deterministically:
+
+* ``lm_head`` emits a fixed control-token script
+  ``[diffusion, diffusion, speech_end, eos]`` (greedy decoding),
+* the inner ``language_model`` returns fixed hidden states,
+* diffusion / tokenizer submodules are mocked with fixed-shape outputs.
+
+Expected loop trace (seq_len=4, max_length_times=2 -> max_steps=8):
+
+    callback(0, 8)                  # initial budget announcement
+    step 1: diffusion  -> callback(1, 8)
+    step 2: diffusion  -> callback(2, 8)
+    step 3: speech_end -> callback(3, 8)
+    step 4: eos        -> finished -> break (no step increment)
+"""
+
+import os
+import sys
+import types
+import importlib.util
+from unittest.mock import MagicMock
+
+import torch
+import torch.nn as nn
+
+
+# ----------------------------------------------------------------------
+# Real-module loading (mirrors tests/test_model_forward.py)
+# ----------------------------------------------------------------------
+def _stub_diffusers():
+    """Stub the diffusers package and submodules the vendored code imports."""
+    if "diffusers" in sys.modules and not isinstance(sys.modules["diffusers"], MagicMock):
+        return  # already a real diffusers
+
+    d = types.ModuleType("diffusers")
+    cu = types.ModuleType("diffusers.configuration_utils")
+    cu.ConfigMixin = object
+    cu.register_to_config = lambda *a, **k: None
+    du = types.ModuleType("diffusers.utils")
+    du.deprecate = lambda *a, **k: None
+    tu = types.ModuleType("diffusers.utils.torch_utils")
+    tu.randn_tensor = lambda *a, **k: None
+    su = types.ModuleType("diffusers.schedulers.scheduling_utils")
+    su.KarrasDiffusionSchedulers = object
+    su.SchedulerMixin = object
+    su.SchedulerOutput = object
+    d.configuration_utils = cu
+    d.utils = du
+    d.schedulers = su
+    sys.modules.setdefault("diffusers", d)
+    sys.modules.setdefault("diffusers.configuration_utils", cu)
+    sys.modules.setdefault("diffusers.utils", du)
+    sys.modules.setdefault("diffusers.utils.torch_utils", tu)
+    sys.modules.setdefault("diffusers.schedulers", su)
+    sys.modules.setdefault("diffusers.schedulers.scheduling_utils", su)
+
+
+def _load_real_modeling_module():
+    """Load the real modeling_vibevoice module, bypassing the conftest mock."""
+    _stub_diffusers()
+    for mod in (
+        "src.vibevoice",
+        "src.vibevoice.modular",
+        "src.vibevoice.modular.modeling_vibevoice",
+        "ComfyUI_VibeVoice.src.vibevoice.modular.modeling_vibevoice",
+    ):
+        sys.modules.pop(mod, None)
+
+    root = os.path.join(os.getcwd(), "src", "vibevoice")
+    mod_pkg = types.ModuleType("src.vibevoice.modular")
+    mod_pkg.__path__ = [os.path.join(root, "modular")]
+    sys.modules.setdefault("src.vibevoice", types.ModuleType("src.vibevoice"))
+    sys.modules["src.vibevoice"].__path__ = [root]
+    sys.modules["src.vibevoice.modular"] = mod_pkg
+
+    cfg_mod = types.ModuleType("src.vibevoice.modular.configuration_vibevoice")
+
+    class _FakeConfig:
+        __name__ = "VibeVoiceConfig"
+        model_type = "vibevoice"
+
+    cfg_mod.VibeVoiceConfig = _FakeConfig
+    sys.modules["src.vibevoice.modular.configuration_vibevoice"] = cfg_mod
+
+    spec = importlib.util.spec_from_file_location(
+        "src.vibevoice.modular.modeling_vibevoice",
+        "src/vibevoice/modular/modeling_vibevoice.py",
+    )
+    module = importlib.util.module_from_spec(spec)
+    sys.modules["src.vibevoice.modular.modeling_vibevoice"] = module
+    spec.loader.exec_module(module)
+    return module
+
+
+_modeling = _load_real_modeling_module()
+VibeVoiceForConditionalGeneration = _modeling.VibeVoiceForConditionalGeneration
+VibeVoiceGenerationOutput = _modeling.VibeVoiceGenerationOutput
+
+
+# ----------------------------------------------------------------------
+# Scripted mock model
+# ----------------------------------------------------------------------
+VOCAB = 100
+HIDDEN = 64
+SEQ_LEN = 4
+
+# Control-token ids used by the scripted lm_head.
+START_ID = 1
+END_ID = 2
+DIFFUSION_ID = 3
+EOS_ID = 4
+BOS_ID = 5
+
+# The control-token script emitted by the scripted lm_head, one per AR step.
+TOKEN_SCRIPT = [DIFFUSION_ID, DIFFUSION_ID, END_ID, EOS_ID]
+EXPECTED_COMPLETED_STEPS = 3  # eos step breaks before `step += 1`
+EXPECTED_MAX_STEPS = 8  # min(max_new_tokens, max_length_times * seq_len) = min(1020, 2*4)
+
+
+class _ScriptedLMHead(nn.Module):
+    """``lm_head`` stand-in: real ``.weight`` (for ``.weight.device`` reads)
+    but scripted logits so greedy decoding follows ``TOKEN_SCRIPT``."""
+
+    def __init__(self, script):
+        super().__init__()
+        self.weight = nn.Parameter(torch.zeros(HIDDEN, VOCAB))
+        self._script = list(script)
+        self._call = 0
+
+    def forward(self, x):
+        idx = self._script[min(self._call, len(self._script) - 1)]
+        self._call += 1
+        logits = torch.full((x.shape[0], VOCAB), -10.0)
+        logits[:, idx] = 10.0
+        return logits
+
+
+class _FakeTokenizer:
+    speech_start_id = START_ID
+    speech_end_id = END_ID
+    speech_diffusion_id = DIFFUSION_ID
+    eos_id = EOS_ID
+    eos_token_id = EOS_ID
+    bos_token_id = BOS_ID
+
+
+class _StepResult:
+    def __init__(self, prev_sample):
+        self.prev_sample = prev_sample
+
+
+def _make_scripted_model():
+    """Build a VibeVoiceForConditionalGeneration whose AR loop is fully driven
+    by mocks and follows ``TOKEN_SCRIPT`` deterministically."""
+    model = VibeVoiceForConditionalGeneration.__new__(VibeVoiceForConditionalGeneration)
+    torch.nn.Module.__init__(model)
+
+    model.config = MagicMock()
+    model.config.use_return_dict = True
+    model.config.diffusion_head_config = MagicMock()
+    model.config.diffusion_head_config.ddpm_num_inference_steps = 5
+    model.config.acoustic_tokenizer_config = MagicMock()
+    model.config.acoustic_tokenizer_config.vae_dim = 64
+    model.config.acoustic_vae_dim = 64
+    model.config.decoder_config = MagicMock()
+    model.config.decoder_config.max_position_embeddings = 1024
+    model.vocab_size = VOCAB
+
+    inner = MagicMock()
+    inner.speech_scaling_factor = torch.tensor(float("nan"))
+    inner.speech_bias_factor = torch.tensor(float("nan"))
+
+    # Diffusion scheduler: one timestep, fixed prev_sample.
+    inner.noise_scheduler = MagicMock()
+    inner.noise_scheduler.timesteps = [torch.tensor(999)]
+    inner.noise_scheduler.set_timesteps = MagicMock()
+    inner.noise_scheduler.step = MagicMock(
+        return_value=_StepResult(torch.zeros(2, 64))
+    )
+
+    # Prediction head: fixed zero noise (CFG combination stays zero).
+    def _pred_head(noisy, timesteps, condition):
+        return torch.zeros(condition.shape[0], 64)
+
+    inner.prediction_head = MagicMock(side_effect=_pred_head)
+    inner.prediction_head.device = torch.device("cpu")
+
+    # Inner language model: fixed hidden states of the right length.
+    def _lm_forward(inputs_embeds=None, **kwargs):
+        x = inputs_embeds
+        if not isinstance(x, torch.Tensor):
+            x = torch.zeros(1, SEQ_LEN, HIDDEN)
+        result = MagicMock()
+        result.last_hidden_state = torch.zeros(x.shape[0], x.shape[1], HIDDEN)
+        result.past_key_values = None
+        return result
+
+    inner.language_model = MagicMock(side_effect=_lm_forward)
+
+    # Acoustic tokenizer: deterministic waveform chunk (Nd, 1, T).
+    inner.acoustic_tokenizer = MagicMock()
+    inner.acoustic_tokenizer.device = torch.device("cpu")
+    inner.acoustic_tokenizer.decode = MagicMock(
+        return_value=torch.full((1, 1, 1600), 0.25)
+    )
+
+    # Semantic tokenizer: encode -> object with .mean (Nd, sem_dim, T_sem).
+    def _sem_encode(audio, **kwargs):
+        nd = audio.shape[0]
+        out = MagicMock()
+        out.mean = torch.zeros(nd, 16, 4)
+        return out
+
+    inner.semantic_tokenizer = MagicMock()
+    inner.semantic_tokenizer.encode = MagicMock(side_effect=_sem_encode)
+
+    # Connectors: (Nd, H) outputs.
+    def _acoustic_connector(f):
+        if f.dim() == 3:
+            return torch.zeros(f.shape[0], f.shape[1], HIDDEN)
+        return torch.zeros(f.shape[0], HIDDEN)
+
+    def _semantic_connector(f):
+        return torch.zeros(f.shape[0], HIDDEN)
+
+    inner.acoustic_connector = MagicMock(side_effect=_acoustic_connector)
+    inner.semantic_connector = MagicMock(side_effect=_semantic_connector)
+    model.model = inner
+
+    model.get_input_embeddings = MagicMock(return_value=nn.Embedding(VOCAB, HIDDEN))
+    model.add_module("lm_head", _ScriptedLMHead(TOKEN_SCRIPT))
+    return model
+
+
+def _generate(model, progress_callback=None, **overrides):
+    """Run generate() with the standard scripted inputs."""
+    kwargs = dict(
+        input_ids=torch.randint(0, VOCAB, (1, SEQ_LEN)),
+        attention_mask=torch.ones(1, SEQ_LEN, dtype=torch.long),
+        acoustic_input_mask=torch.zeros(1, SEQ_LEN, dtype=torch.bool),
+        cfg_scale=1.3,
+        inference_steps=5,
+        return_speech=True,
+        do_sample=False,
+        tokenizer=_FakeTokenizer(),
+    )
+    kwargs.update(overrides)
+    if progress_callback is not None:
+        kwargs["progress_callback"] = progress_callback
+    return model.generate(**kwargs)
+
+
+# ----------------------------------------------------------------------
+# Tests
+# ----------------------------------------------------------------------
+class TestProgressCallbackContract:
+    def test_callback_none_backward_compatible(self):
+        """T1.1: generate() without progress_callback runs unchanged."""
+        model = _make_scripted_model()
+        out = _generate(model)
+        assert isinstance(out, VibeVoiceGenerationOutput)
+        assert out.speech_outputs is not None
+        assert len(out.speech_outputs) == 1
+        assert isinstance(out.speech_outputs[0], torch.Tensor)
+
+    def test_callback_sequence_monotonic_and_bounded(self):
+        """T1.2: first call is (0, max_steps); currents monotonic, <= total."""
+        model = _make_scripted_model()
+        calls = []
+        _generate(model, progress_callback=lambda c, t: calls.append((c, t)))
+
+        assert calls, "progress_callback was never invoked"
+        assert calls[0] == (0, EXPECTED_MAX_STEPS)
+        currents = [c for c, _ in calls]
+        totals = [t for _, t in calls]
+        assert currents == sorted(currents), "current must be monotonic non-decreasing"
+        assert all(0 <= c <= EXPECTED_MAX_STEPS for c in currents)
+        assert set(totals) == {EXPECTED_MAX_STEPS}, "total must stay constant"
+
+    def test_callback_count_matches_completed_steps(self):
+        """T1.3: exactly one initial call + one call per completed AR step."""
+        model = _make_scripted_model()
+        calls = []
+        _generate(model, progress_callback=lambda c, t: calls.append((c, t)))
+
+        # 1 initial + EXPECTED_COMPLETED_STEPS per-step calls.
+        assert len(calls) == 1 + EXPECTED_COMPLETED_STEPS
+        assert [c for c, _ in calls] == [0, 1, 2, 3]
+
+    def test_callback_exception_propagates(self):
+        """T1.4: a raising callback interrupts generation (exception propagates)."""
+        model = _make_scripted_model()
+
+        def _raiser(current, total):
+            if current >= 2:
+                raise RuntimeError("interrupt requested")
+
+        try:
+            _generate(model, progress_callback=_raiser)
+            raised = False
+        except RuntimeError as e:
+            raised = "interrupt requested" in str(e)
+        assert raised, "callback exception must propagate out of generate()"
+
+    def test_output_identical_with_and_without_callback(self):
+        """T1.5: progress plumbing must not change generated audio."""
+        model_a = _make_scripted_model()
+        out_a = _generate(model_a)
+
+        model_b = _make_scripted_model()
+        out_b = _generate(model_b, progress_callback=lambda c, t: None)
+
+        assert torch.equal(out_a.speech_outputs[0], out_b.speech_outputs[0])
diff --git a/tests/test_generation.py b/tests/test_generation.py
index 69fd950..f5ab4fb 100644
--- a/tests/test_generation.py
+++ b/tests/test_generation.py
@@ -470,3 +470,147 @@ class TestForceOffloadModel:
             force_offload_model(mock_patcher, "TestModel", warm=True)
 
         mock_patcher.unpatch_model.assert_called_once_with(unpatch_weights=True, warm=True)
+
+
+class TestGenerateAudioProgressReporting:
+    """Phase 2 (2026-08-15 progress plan): generate_audio() must drive the
+    standard ComfyUI ProgressBar through the vendored progress_callback."""
+
+    @staticmethod
+    def _run(progress_callback_capture: list, generate_side_effect=None):
+        """Run generate_audio with a mocked model/processor; capture the
+        progress_callback kwarg handed to model.generate."""
+        mock_model = MagicMock()
+        mock_model.device = torch.device("cpu")
+        mock_output = MagicMock()
+        mock_output.speech_outputs = [torch.randn(24000)]
+        if generate_side_effect is not None:
+            mock_model.generate.side_effect = generate_side_effect
+        else:
+            mock_model.generate.return_value = mock_output
+
+        mock_processor = MagicMock()
+        mock_processor.return_value = {"input_ids": torch.randint(0, 100, (1, 10))}
+        mock_processor.tokenizer = MagicMock()
+
+        with patch("ComfyUI_VibeVoice.modules.generation.ProgressBar") as mock_pbar_cls, \
+             patch("ComfyUI_VibeVoice.modules.generation.model_management.throw_exception_if_processing_interrupted") as mock_interrupt, \
+             patch("ComfyUI_VibeVoice.modules.generation.preprocess_comfy_audio", return_value=_mock_voice_sample()):
+            mock_pbar = MagicMock()
+            mock_pbar.total = 10
+            mock_pbar_cls.return_value = mock_pbar
+
+            # Capture the callback the wrapper passes into the vendored loop.
+            def _capture(**kwargs):
+                progress_callback_capture.append(kwargs.get("progress_callback"))
+                return mock_output
+
+            if generate_side_effect is None:
+                mock_model.generate.side_effect = _capture
+
+            result = generate_audio(
+                model=mock_model,
+                processor=mock_processor,
+                text="[1] Hello world",
+                voice_samples=[{"waveform": torch.randn(1, 1, 24000), "sample_rate": 24000}],
+                speaker_ids=[1],
+                inference_steps=10,
+            )
+            return result, mock_model, mock_pbar_cls, mock_pbar, mock_interrupt
+
+    def test_generate_receives_callable_progress_callback(self):
+        """T2.1: model.generate must receive a callable progress_callback kwarg."""
+        captured = []
+        self._run(captured)
+        assert captured, "model.generate was not called"
+        assert captured[0] is not None and callable(captured[0])
+
+    def test_callback_maps_to_update_absolute_with_total(self):
+        """T2.2: callback(current, total) -> pbar.update_absolute(current, total=total)."""
+        captured = []
+        _, _, _, mock_pbar, _ = self._run(captured)
+        mock_pbar.update_absolute.reset_mock()
+
+        captured[0](3, 10)
+        mock_pbar.update_absolute.assert_called_once_with(3, total=10)
+
+    def test_callback_checks_interrupt(self):
+        """T2.3: the callback must call throw_exception_if_processing_interrupted;
+        a raised interrupt propagates to the caller. The callback is invoked
+        INSIDE the patch context so the interrupt mock is still active."""
+        import comfy.model_management as mm
+
+        mock_model = MagicMock()
+        mock_model.device = torch.device("cpu")
+        mock_output = MagicMock()
+        mock_output.speech_outputs = [torch.randn(24000)]
+        mock_model.generate.return_value = mock_output
+
+        mock_processor = MagicMock()
+        mock_processor.return_value = {"input_ids": torch.randint(0, 100, (1, 10))}
+        mock_processor.tokenizer = MagicMock()
+
+        with patch("ComfyUI_VibeVoice.modules.generation.ProgressBar") as mock_pbar_cls, \
+             patch("ComfyUI_VibeVoice.modules.generation.model_management.throw_exception_if_processing_interrupted") as mock_interrupt, \
+             patch("ComfyUI_VibeVoice.modules.generation.preprocess_comfy_audio", return_value=_mock_voice_sample()):
+            mock_pbar = MagicMock()
+            mock_pbar.total = 10
+            mock_pbar_cls.return_value = mock_pbar
+            mock_interrupt.side_effect = mm.InterruptProcessingException()
+
+            generate_audio(
+                model=mock_model,
+                processor=mock_processor,
+                text="[1] Hello world",
+                voice_samples=[{"waveform": torch.randn(1, 1, 24000), "sample_rate": 24000}],
+                speaker_ids=[1],
+                inference_steps=10,
+            )
+
+            cb = mock_model.generate.call_args.kwargs.get("progress_callback")
+            assert cb is not None and callable(cb)
+            with pytest.raises(mm.InterruptProcessingException):
+                cb(1, 10)
+            mock_interrupt.assert_called()
+
+    def test_final_update_reaches_total_on_success(self):
+        """T2.4: after successful generation the bar is driven to 100%."""
+        captured = []
+        _, _, mock_pbar_cls, mock_pbar, _ = self._run(captured)
+
+        # Initial estimate = inference_steps.
+        mock_pbar_cls.assert_called_once_with(10)
+        # The very last update_absolute call must be the final (total) event.
+        final_call = mock_pbar.update_absolute.call_args_list[-1]
+        assert final_call.args == (10,), f"final update must be (total,), got {final_call}"
+
+    def test_final_update_sent_even_when_generate_raises(self):
+        """T2.5: the finally-block final update fires when model.generate raises."""
+        mock_model = MagicMock()
+        mock_model.device = torch.device("cpu")
+        mock_model.generate.side_effect = RuntimeError("boom")
+
+        mock_processor = MagicMock()
+        mock_processor.return_value = {"input_ids": torch.randint(0, 100, (1, 10))}
+        mock_processor.tokenizer = MagicMock()
+
+        with patch("ComfyUI_VibeVoice.modules.generation.ProgressBar") as mock_pbar_cls, \
+             patch("ComfyUI_VibeVoice.modules.generation.model_management.throw_exception_if_processing_interrupted"), \
+             patch("ComfyUI_VibeVoice.modules.generation.preprocess_comfy_audio", return_value=_mock_voice_sample()):
+            mock_pbar = MagicMock()
+            mock_pbar.total = 10
+            mock_pbar_cls.return_value = mock_pbar
+
+            with pytest.raises(RuntimeError, match="boom"):
+                generate_audio(
+                    model=mock_model,
+                    processor=mock_processor,
+                    text="[1] Hello world",
+                    voice_samples=[{"waveform": torch.randn(1, 1, 24000), "sample_rate": 24000}],
+                    speaker_ids=[1],
+                    inference_steps=10,
+                )
+
+            # The final absolute update must still have been sent.
+            final_call = mock_pbar.update_absolute.call_args_list[-1]
+            assert final_call.args == (10,)
diff --git a/tests/test_integration.py b/tests/test_integration.py
index 8920eae..85f9436 100644
--- a/tests/test_integration.py
+++ b/tests/test_integration.py
@@ -193,3 +193,181 @@ class TestFullPipelineMocked:
                     voice_samples=[_mock_audio_dict()],
                     speaker_ids=[1],
                 )
+
+
+class TestNodeProgressIntegration:
+    """Phase 6 (2026-08-15 progress plan): each node's execute path must drive
+    the standard ComfyUI ProgressBar with increasing values. The mocked model
+    invokes the progress hook 3x, simulating a 3-step loop."""
+
+    def test_tts_node_reports_increasing_progress(self):
+        from ComfyUI_VibeVoice.nodes.tts_node import VibeVoiceTTSNode
+
+        mock_model = MagicMock()
+        mock_model.device = torch.device("cpu")
+        mock_output = MagicMock()
+        mock_output.speech_outputs = [torch.randn(24000)]
+
+        def _generate(**kwargs):
+            cb = kwargs.get("progress_callback")
+            if cb is not None:
+                for i in (1, 2, 3):
+                    cb(i, 10)
+            return mock_output
+
+        mock_model.generate.side_effect = _generate
+        mock_processor = MagicMock()
+        mock_processor.return_value = {"input_ids": torch.randint(0, 100, (1, 10))}
+        mock_processor.tokenizer = MagicMock()
+        mock_patcher = MagicMock()
+
+        with patch("ComfyUI_VibeVoice.nodes.tts_node.load_vibevoice_model",
+                   return_value=(mock_patcher, mock_model, mock_processor)), \
+             patch("ComfyUI_VibeVoice.nodes.tts_node.ui.PreviewAudio", MagicMock()), \
+             patch("ComfyUI_VibeVoice.modules.generation.ProgressBar") as mock_pbar_cls, \
+             patch("ComfyUI_VibeVoice.modules.generation.model_management.throw_exception_if_processing_interrupted"), \
+             patch("ComfyUI_VibeVoice.modules.generation.preprocess_comfy_audio",
+                   return_value=_mock_voice_sample()):
+            mock_pbar = MagicMock()
+            mock_pbar.total = 10
+            mock_pbar_cls.return_value = mock_pbar
+
+            VibeVoiceTTSNode.execute(
+                model_name="TestModel",
+                text="[1] Hello world",
+                quantize_llm_4bit=False,
+                attention_mode="sdpa",
+                cfg_scale=1.3,
+                inference_steps=10,
+                seed=42,
+                do_sample=True,
+                temperature=0.95,
+                top_p=0.95,
+                top_k=0,
+                force_offload=False,
+                device="cpu",
+                dtype="fp32",
+                max_new_tokens=0,
+                speaker_1_voice=_mock_audio_dict(),
+            )
+
+            values = [c.args[0] for c in mock_pbar.update_absolute.call_args_list if c.args]
+            assert 1 in values and 2 in values and 3 in values
+            assert values == sorted(values), f"progress must be monotonic, got {values}"
+
+    def test_realtime_node_reports_increasing_progress(self):
+        from ComfyUI_VibeVoice.nodes.realtime_node import VibeVoiceRealtimeNode
+
+        mock_model = MagicMock()
+        mock_model.device = torch.device("cpu")
+        mock_output = MagicMock()
+        mock_output.speech_outputs = [torch.randn(24000)]
+
+        def _generate(**kwargs):
+            cb = kwargs.get("progress_callback")
+            if cb is not None:
+                for i in (1, 2, 3):
+                    cb(i, 512)
+            return mock_output
+
+        mock_model.generate.side_effect = _generate
+        mock_processor = MagicMock()
+        mock_processor.tokenizer = MagicMock()
+        mock_processor.tokenizer.encode = MagicMock(return_value=[10, 11, 12])
+        mock_processor.prepare_speech_inputs = MagicMock(return_value={
+            "padded_speeches": torch.randn(1, 100),
+            "speech_masks": torch.ones(1, 100, dtype=torch.bool),
+        })
+        mock_patcher = MagicMock()
+
+        with patch("ComfyUI_VibeVoice.nodes.realtime_node.load_vibevoice_model",
+                   return_value=(mock_patcher, mock_model, mock_processor)), \
+             patch("ComfyUI_VibeVoice.nodes.realtime_node.ui.PreviewAudio", MagicMock()), \
+             patch("ComfyUI_VibeVoice.modules.generation.ProgressBar") as mock_pbar_cls, \
+             patch("ComfyUI_VibeVoice.modules.generation.model_management.throw_exception_if_processing_interrupted"), \
+             patch("ComfyUI_VibeVoice.modules.generation.prefill_voice_prompt",
+                   return_value={"lm": MagicMock()}), \
+             patch("ComfyUI_VibeVoice.modules.generation.preprocess_comfy_audio",
+                   return_value=_mock_voice_sample()):
+            mock_pbar = MagicMock()
+            mock_pbar.total = 1
+            mock_pbar_cls.return_value = mock_pbar
+
+            VibeVoiceRealtimeNode.execute(
+                model_name="TestStreamingModel",
+                text="[1] Hello world",
+                quantize_llm_4bit=False,
+                attention_mode="sdpa",
+                cfg_scale=1.3,
+                inference_steps=10,
+                seed=42,
+                do_sample=True,
+                temperature=0.95,
+                top_p=0.95,
+                top_k=0,
+                stream=False,
+                force_offload=False,
+                device="cpu",
+                dtype="fp32",
+                speaker_1_voice=_mock_audio_dict(),
+            )
+
+            values = [c.args[0] for c in mock_pbar.update_absolute.call_args_list if c.args]
+            # Loop updates (all but the final guaranteed event) must be monotonic.
+            loop_values = values[:-1]
+            assert 1 in loop_values and 2 in loop_values and 3 in loop_values
+            assert loop_values == sorted(loop_values), f"progress must be monotonic, got {loop_values}"
+            # The final event must always be present (guaranteed 100%).
+            assert values[-1] == mock_pbar.total
+
+    def test_asr_node_reports_increasing_progress(self):
+        from ComfyUI_VibeVoice.nodes.asr_node import VibeVoiceASRNode
+
+        mock_model = MagicMock()
+        mock_param = MagicMock()
+        mock_param.device = torch.device("cpu")
+        mock_model.parameters.return_value = iter([mock_param])
+
+        def _generate(**kwargs):
+            streamer = kwargs.get("streamer")
+            if streamer is not None:
+                for tok in (10, 11, 12):
+                    streamer.put(torch.tensor([tok]))
+                streamer.end()
+            return torch.tensor([[1, 2, 3, 10, 11, 12, 0]])
+
+        mock_model.generate.side_effect = _generate
+        mock_processor = MagicMock()
+        mock_processor.return_value = {"input_ids": torch.tensor([[1, 2, 3]])}
+        mock_processor.pad_id = 0
+        mock_processor.tokenizer.eos_token_id = 0
+        mock_processor.decode.return_value = "Hello world"
+        mock_processor.post_process_transcription.return_value = []
+        mock_patcher = MagicMock()
+
+        with patch("ComfyUI_VibeVoice.nodes.asr_node.load_asr_model_patched",
+                   return_value=(mock_patcher, mock_model, mock_processor)), \
+             patch("ComfyUI_VibeVoice.modules.asr_generation.ProgressBar") as mock_pbar_cls, \
+             patch("ComfyUI_VibeVoice.modules.asr_generation.model_management.throw_exception_if_processing_interrupted"):
+            mock_pbar = MagicMock()
+            mock_pbar.total = 32768
+            mock_pbar_cls.return_value = mock_pbar
+
+            VibeVoiceASRNode.execute(
+                model_name="VibeVoice-ASR",
+                audio=_mock_audio_dict(),
+                context_info="",
+                max_new_tokens=32768,
+                temperature=0.0,
+                top_p=1.0,
+                do_sample=False,
+                num_beams=1,
+                device="cpu",
+                dtype="fp32",
+                attention_mode="sdpa",
+                force_offload=False,
+            )
+
+            values = [c.args[0] for c in mock_pbar.update_absolute.call_args_list if c.args]
+            assert 1 in values and 2 in values and 3 in values
+            assert values == sorted(values), f"progress must be monotonic, got {values}"
diff --git a/tests/test_streaming_progress.py b/tests/test_streaming_progress.py
new file mode 100644
index 0000000..5a30142
--- /dev/null
+++ b/tests/test_streaming_progress.py
@@ -0,0 +1,150 @@
+"""Tests for ComfyUI progress reporting in ``generate_streaming_audio()``
+(Phase 4 of the 2026-08-15 inference-progress-reporting plan).
+
+The streaming wrapper must:
+* pass a callable ``progress_callback`` into the vendored streaming
+  ``model.generate``,
+* map ``callback(current, total)`` -> ``ProgressBar.update_absolute(current,
+  total=total)`` (the bar's placeholder total is corrected dynamically),
+* check for user interruption inside the callback,
+* always send the final 100% event (success and exception paths).
+"""
+
+import numpy as np
+import torch
+import pytest
+from unittest.mock import patch, MagicMock
+
+from ComfyUI_VibeVoice.modules.generation import generate_streaming_audio
+
+
+def _mock_voice_sample(length: int = 24000) -> np.ndarray:
+    return np.random.randn(length).astype(np.float32)
+
+
+def _run_streaming(generate_side_effect=None, expect_exception=None):
+    """Run generate_streaming_audio with fully mocked model/processor/prefill.
+
+    When ``expect_exception`` is given, the call is wrapped in
+    ``pytest.raises``. Returns (mock_model, mock_pbar_cls, mock_pbar,
+    mock_interrupt).
+    """
+    mock_model = MagicMock()
+    mock_model.device = torch.device("cpu")
+    mock_output = MagicMock()
+    mock_output.speech_outputs = [torch.randn(24000)]
+    if generate_side_effect is not None:
+        mock_model.generate.side_effect = generate_side_effect
+    else:
+        mock_model.generate.return_value = mock_output
+
+    mock_processor = MagicMock()
+    mock_processor.tokenizer = MagicMock()
+    mock_processor.tokenizer.encode = MagicMock(return_value=[10, 11, 12])
+    mock_processor.prepare_speech_inputs = MagicMock(
+        return_value={
+            "padded_speeches": torch.randn(1, 100),
+            "speech_masks": torch.ones(1, 100, dtype=torch.bool),
+        }
+    )
+
+    with patch("ComfyUI_VibeVoice.modules.generation.ProgressBar") as mock_pbar_cls, \
+         patch("ComfyUI_VibeVoice.modules.generation.model_management.throw_exception_if_processing_interrupted") as mock_interrupt, \
+         patch("ComfyUI_VibeVoice.modules.generation.prefill_voice_prompt", return_value={"lm": MagicMock()}), \
+         patch("ComfyUI_VibeVoice.modules.generation.preprocess_comfy_audio", return_value=_mock_voice_sample()):
+        mock_pbar = MagicMock()
+        mock_pbar.total = 1
+        mock_pbar_cls.return_value = mock_pbar
+
+        call = lambda: generate_streaming_audio(
+            model=mock_model,
+            processor=mock_processor,
+            text="[1] Hello world",
+            voice_samples=[{"waveform": torch.randn(1, 1, 24000), "sample_rate": 24000}],
+            speaker_ids=[1],
+            inference_steps=10,
+        )
+        if expect_exception is not None:
+            with pytest.raises(expect_exception):
+                call()
+        else:
+            call()
+        return mock_model, mock_pbar_cls, mock_pbar, mock_interrupt
+
+
+class TestStreamingProgressReporting:
+    def test_generate_receives_callable_progress_callback(self):
+        """T4.1: streaming model.generate must receive a callable progress_callback."""
+        mock_model, _, _, _ = _run_streaming()
+        gen_kwargs = mock_model.generate.call_args.kwargs
+        cb = gen_kwargs.get("progress_callback")
+        assert cb is not None and callable(cb)
+
+    def test_callback_maps_to_update_absolute_with_total(self):
+        """T4.2: callback(current, total) -> pbar.update_absolute(current, total=total)."""
+        mock_model, _, mock_pbar, _ = _run_streaming()
+        cb = mock_model.generate.call_args.kwargs["progress_callback"]
+        mock_pbar.update_absolute.reset_mock()
+
+        cb(42, 512)
+        mock_pbar.update_absolute.assert_called_once_with(42, total=512)
+
+    def test_callback_checks_interrupt(self):
+        """T4.3a: the callback must call throw_exception_if_processing_interrupted;
+        a raised interrupt propagates to the caller."""
+        import comfy.model_management as mm
+
+        mock_model = MagicMock()
+        mock_model.device = torch.device("cpu")
+        mock_output = MagicMock()
+        mock_output.speech_outputs = [torch.randn(24000)]
+        mock_model.generate.return_value = mock_output
+
+        mock_processor = MagicMock()
+        mock_processor.tokenizer = MagicMock()
+        mock_processor.tokenizer.encode = MagicMock(return_value=[10, 11, 12])
+        mock_processor.prepare_speech_inputs = MagicMock(
+            return_value={
+                "padded_speeches": torch.randn(1, 100),
+                "speech_masks": torch.ones(1, 100, dtype=torch.bool),
+            }
+        )
+
+        with patch("ComfyUI_VibeVoice.modules.generation.ProgressBar") as mock_pbar_cls, \
+             patch("ComfyUI_VibeVoice.modules.generation.model_management.throw_exception_if_processing_interrupted") as mock_interrupt, \
+             patch("ComfyUI_VibeVoice.modules.generation.prefill_voice_prompt", return_value={"lm": MagicMock()}), \
+             patch("ComfyUI_VibeVoice.modules.generation.preprocess_comfy_audio", return_value=_mock_voice_sample()):
+            mock_pbar = MagicMock()
+            mock_pbar.total = 1
+            mock_pbar_cls.return_value = mock_pbar
+            mock_interrupt.side_effect = mm.InterruptProcessingException()
+
+            generate_streaming_audio(
+                model=mock_model,
+                processor=mock_processor,
+                text="[1] Hello world",
+                voice_samples=[{"waveform": torch.randn(1, 1, 24000), "sample_rate": 24000}],
+                speaker_ids=[1],
+                inference_steps=10,
+            )
+
+            cb = mock_model.generate.call_args.kwargs["progress_callback"]
+            with pytest.raises(mm.InterruptProcessingException):
+                cb(1, 512)
+            mock_interrupt.assert_called()
+
+    def test_final_update_sent_on_success_and_exception(self):
+        """T4.3b: the finally-block final update fires on success and on raise."""
+        # Success path.
+        _, mock_pbar_cls, mock_pbar, _ = _run_streaming()
+        mock_pbar_cls.assert_called_once_with(1)  # placeholder total
+        final_call = mock_pbar.update_absolute.call_args_list[-1]
+        assert final_call.args == (1,), f"final update must be (total,), got {final_call}"
+
+        # Exception path.
+        mock_model, mock_pbar_cls2, mock_pbar2, _ = _run_streaming(
+            generate_side_effect=RuntimeError("boom"),
+            expect_exception=RuntimeError,
+        )
+        final_call2 = mock_pbar2.update_absolute.call_args_list[-1]
+        assert final_call2.args == (1,)
diff --git a/tests/test_streaming_progress_callback.py b/tests/test_streaming_progress_callback.py
new file mode 100644
index 0000000..ff521d7
--- /dev/null
+++ b/tests/test_streaming_progress_callback.py
@@ -0,0 +1,286 @@
+"""Tests for the ``progress_callback`` hook in the streaming
+``VibeVoiceStreamingForConditionalGenerationInference.generate()`` (Phase 3 of
+the 2026-08-15 inference-progress-reporting plan).
+
+The real vendored module is loaded with heavy sibling modules stubbed. The
+GenerationMixin plumbing (``_build_generate_config_model_kwargs``,
+``prepare_inputs_for_generation``, ``forward_lm`` / ``forward_tts_lm``,
+``sample_speech_tokens``) is mocked so the REAL windowed AR loop runs
+deterministically:
+
+* one text window of ``TTS_TEXT_WINDOW_SIZE`` (5) tokens -> 1 callback,
+* ``TTS_SPEECH_WINDOW_SIZE`` (6) speech tokens -> 6 callbacks
+  (the inner speech loop does not break on EOS; EOS only stops the outer
+  while-loop on the next iteration),
+* ``tts_eos_classifier`` returns a high logit so the outer loop stops after
+  the first text window.
+
+Expected callback trace (initial step = tts_lm_input_ids len = 3,
+max_length = 100):
+
+    (8, 100)                       # text window prefill (3 + 5)
+    (9, 100) ... (14, 100)         # six speech tokens
+"""
+
+import os
+import sys
+import types
+import importlib.util
+from types import SimpleNamespace
+from unittest.mock import MagicMock
+
+import torch
+import torch.nn as nn
+
+from transformers.modeling_utils import PreTrainedModel
+
+
+HIDDEN = 64
+MAX_LENGTH = 100
+TEXT_LEN = 5          # one full text window
+TTS_LM_INIT_LEN = 3   # initial tts_lm_input_ids length -> initial `step`
+EXPECTED_TEXT_CALLBACK_STEP = TTS_LM_INIT_LEN + TEXT_LEN  # 8
+EXPECTED_SPEECH_CALLBACKS = 6  # TTS_SPEECH_WINDOW_SIZE
+
+
+# ----------------------------------------------------------------------
+# Stubs + real-module loading
+# ----------------------------------------------------------------------
+class _FakeStreamingConfig:
+    __name__ = "VibeVoiceStreamingConfig"
+    model_type = "vibevoice_streaming"
+
+
+class _FakeStreamingPreTrainedModel(PreTrainedModel):
+    """Real PreTrainedModel subclass so the inference class can inherit from it."""
+
+    config_class = _FakeStreamingConfig
+    base_model_prefix = "model"
+
+    def _init_weights(self, module):
+        pass
+
+
+def _install_stub_modules():
+    """Replace the conftest MagicMocks for the streaming module's imports with
+    stubs that provide real classes where inheritance/instantiation requires
+    them."""
+    streaming_pkg_root = os.path.join(os.getcwd(), "src", "vibevoice")
+
+    # Package hierarchy (needed for relative imports during exec).
+    if "src.vibevoice" not in sys.modules or not hasattr(sys.modules["src.vibevoice"], "__path__"):
+        pkg = types.ModuleType("src.vibevoice")
+        pkg.__path__ = [streaming_pkg_root]
+        sys.modules["src.vibevoice"] = pkg
+    else:
+        sys.modules["src.vibevoice"].__path__ = [streaming_pkg_root]
+
+    mod_pkg_name = "src.vibevoice.modular"
+    if mod_pkg_name not in sys.modules or not hasattr(sys.modules[mod_pkg_name], "__path__"):
+        mod_pkg = types.ModuleType(mod_pkg_name)
+        mod_pkg.__path__ = [os.path.join(streaming_pkg_root, "modular")]
+        sys.modules[mod_pkg_name] = mod_pkg
+    else:
+        sys.modules[mod_pkg_name].__path__ = [os.path.join(streaming_pkg_root, "modular")]
+
+    # modeling_vibevoice_streaming: must expose a REAL PreTrainedModel subclass.
+    ms = types.ModuleType("src.vibevoice.modular.modeling_vibevoice_streaming")
+    ms.VibeVoiceStreamingPreTrainedModel = _FakeStreamingPreTrainedModel
+    ms.VibeVoiceStreamingModel = MagicMock()
+    ms.BinaryClassifier = MagicMock()
+    sys.modules["src.vibevoice.modular.modeling_vibevoice_streaming"] = ms
+
+    # configuration_vibevoice_streaming: plain class with model_type (register()).
+    cfg = types.ModuleType("src.vibevoice.modular.configuration_vibevoice_streaming")
+    cfg.VibeVoiceStreamingConfig = _FakeStreamingConfig
+    sys.modules["src.vibevoice.modular.configuration_vibevoice_streaming"] = cfg
+
+    # The remaining imports survive as conftest MagicMocks (names only), but
+    # ensure they exist so `from .x import Y` resolves.
+    for name in (
+        "src.vibevoice.modular.modular_vibevoice_tokenizer",
+        "src.vibevoice.modular.modular_vibevoice_diffusion_head",
+        "src.vibevoice.modular.modular_vibevoice_text_tokenizer",
+        "src.vibevoice.modular.streamer",
+        "src.vibevoice.schedule.dpm_solver",
+    ):
+        sys.modules.setdefault(name, MagicMock())
+
+
+def _load_real_streaming_module():
+    _install_stub_modules()
+    sys.modules.pop("src.vibevoice.modular.modeling_vibevoice_streaming_inference", None)
+
+    spec = importlib.util.spec_from_file_location(
+        "src.vibevoice.modular.modeling_vibevoice_streaming_inference",
+        "src/vibevoice/modular/modeling_vibevoice_streaming_inference.py",
+    )
+    module = importlib.util.module_from_spec(spec)
+    sys.modules["src.vibevoice.modular.modeling_vibevoice_streaming_inference"] = module
+    spec.loader.exec_module(module)
+    return module
+
+
+_streaming = _load_real_streaming_module()
+VibeVoiceStreamingForConditionalGenerationInference = (
+    _streaming.VibeVoiceStreamingForConditionalGenerationInference
+)
+VibeVoiceGenerationOutput = _streaming.VibeVoiceGenerationOutput
+
+
+# ----------------------------------------------------------------------
+# Scripted mock model
+# ----------------------------------------------------------------------
+class _FakeTokenizer:
+    bos_token_id = 1
+    eos_token_id = 2
+    pad_token_id = 0
+    speech_start_id = 3
+    speech_end_id = 4
+    speech_diffusion_id = 5
+
+    def convert_tokens_to_ids(self, token):
+        return 7
+
+
+class _FakeForwardOutput:
+    def __init__(self, seq_len: int = 4):
+        self.last_hidden_state = torch.zeros(1, seq_len, HIDDEN)
+        self.past_key_values = None
+
+
+def _make_streaming_model():
+    cls = VibeVoiceStreamingForConditionalGenerationInference
+    model = cls.__new__(cls)
+    torch.nn.Module.__init__(model)
+    # A real parameter so `self.device` resolves (PreTrainedModel.device).
+    model.register_parameter("_dummy", nn.Parameter(torch.zeros(1)))
+
+    model.config = MagicMock()
+    model.config.acoustic_vae_dim = HIDDEN
+    model.config.decoder_config = MagicMock()
+    model.config.decoder_config.max_position_embeddings = 1024
+    model.config.decoder_config.hidden_size = HIDDEN
+    model.config.diffusion_head_config = MagicMock()
+    model.config.diffusion_head_config.ddpm_num_inference_steps = 5
+    model.ddpm_inference_steps = 5
+
+    inner = MagicMock()
+    inner.speech_scaling_factor = torch.tensor(1.0)
+    inner.speech_bias_factor = torch.tensor(0.0)
+    inner.acoustic_tokenizer = MagicMock()
+    inner.acoustic_tokenizer.device = torch.device("cpu")
+    inner.acoustic_tokenizer.decode = MagicMock(return_value=torch.full((1, 1600), 0.25))
+    inner.acoustic_connector = MagicMock(return_value=torch.zeros(1, 1, HIDDEN))
+    model.model = inner
+
+    # EOS classifier: high logit -> sigmoid > 0.5 -> finished after window 1.
+    model.tts_eos_classifier = MagicMock(return_value=torch.tensor([[10.0]]))
+
+    # --- GenerationMixin plumbing mocks -------------------------------
+    def _build_cfg(generation_config, inputs, tokenizer, return_processors=False, **kw):
+        cfg = SimpleNamespace(max_length=MAX_LENGTH, min_length=0)
+        ids = kw.get("input_ids")
+        if ids is None:
+            ids = torch.zeros(1, 1, dtype=torch.long)
+        mk = {
+            "input_ids": ids,
+            "attention_mask": torch.ones(1, ids.shape[1], dtype=torch.long),
+            "cache_position": torch.arange(ids.shape[1], dtype=torch.long),
+            "past_key_values": None,
+            "use_cache": True,
+        }
+        if return_processors:
+            return cfg, mk, ids, [], []
+        return cfg, mk, ids
+
+    model._build_generate_config_model_kwargs = MagicMock(side_effect=_build_cfg)
+    model.prepare_inputs_for_generation = MagicMock(return_value={})
+    model.forward_lm = MagicMock(return_value=_FakeForwardOutput())
+    model.forward_tts_lm = MagicMock(return_value=_FakeForwardOutput())
+    model.sample_speech_tokens = MagicMock(return_value=torch.zeros(1, HIDDEN))
+    # Bypass the GenerationMixin cache bookkeeping (module-level
+    # _update_model_kwargs_for_generation still runs with real tensors).
+    model._update_model_kwargs_for_generation = (
+        lambda outputs, model_kwargs, is_encoder_decoder=False, num_new_tokens=1: model_kwargs
+    )
+    return model
+
+
+def _run_generate(model, progress_callback=None):
+    kwargs = dict(
+        input_ids=torch.randint(0, 100, (1, 4)),
+        tts_text_ids=torch.randint(0, 100, (1, TEXT_LEN)),
+        tts_lm_input_ids=torch.randint(0, 100, (1, TTS_LM_INIT_LEN)),
+        tokenizer=_FakeTokenizer(),
+        all_prefilled_outputs={
+            "lm": _FakeForwardOutput(),
+            "tts_lm": _FakeForwardOutput(),
+            "neg_lm": _FakeForwardOutput(),
+            "neg_tts_lm": _FakeForwardOutput(),
+        },
+        max_new_tokens=50,
+        cfg_scale=1.0,
+        return_speech=True,
+        show_progress_bar=False,  # silence the console tqdm bar
+    )
+    if progress_callback is not None:
+        kwargs["progress_callback"] = progress_callback
+    return model.generate(**kwargs)
+
+
+# ----------------------------------------------------------------------
+# Tests
+# ----------------------------------------------------------------------
+class TestStreamingProgressCallbackContract:
+    def test_callback_none_backward_compatible(self):
+        """T3.1: generate() without progress_callback runs unchanged."""
+        model = _make_streaming_model()
+        out = _run_generate(model)
+        assert isinstance(out, VibeVoiceGenerationOutput)
+        assert out.speech_outputs is not None
+        assert len(out.speech_outputs) == 1
+        assert isinstance(out.speech_outputs[0], torch.Tensor)
+
+    def test_callback_monotonic_with_constant_total(self):
+        """T3.2: currents monotonic non-decreasing; total == max_length always."""
+        model = _make_streaming_model()
+        calls = []
+        _run_generate(model, progress_callback=lambda c, t: calls.append((c, t)))
+
+        assert calls, "progress_callback was never invoked"
+        currents = [c for c, _ in calls]
+        totals = [t for _, t in calls]
+        assert currents == sorted(currents)
+        assert set(totals) == {MAX_LENGTH}
+        assert all(0 <= c <= MAX_LENGTH for c in currents)
+
+    def test_callback_fires_for_text_window_and_speech_tokens(self):
+        """T3.3: one callback after the text-window prefill and one per
+        generated speech token (TTS_SPEECH_WINDOW_SIZE = 6)."""
+        model = _make_streaming_model()
+        calls = []
+        _run_generate(model, progress_callback=lambda c, t: calls.append((c, t)))
+
+        assert len(calls) == 1 + EXPECTED_SPEECH_CALLBACKS, f"got {calls}"
+        # First call: text window prefill advanced step by TEXT_LEN.
+        assert calls[0] == (EXPECTED_TEXT_CALLBACK_STEP, MAX_LENGTH)
+        # Speech-token calls increment by exactly 1 each.
+        speech_currents = [c for c, _ in calls[1:]]
+        assert speech_currents == [
+            EXPECTED_TEXT_CALLBACK_STEP + i + 1 for i in range(EXPECTED_SPEECH_CALLBACKS)
+        ]
+
+    def test_callback_exception_propagates(self):
+        """T3.4: a raising callback interrupts generation."""
+        model = _make_streaming_model()
+
+        def _raiser(current, total):
+            raise RuntimeError("interrupt requested")
+
+        try:
+            _run_generate(model, progress_callback=_raiser)
+            raised = False
+        except RuntimeError as e:
+            raised = "interrupt requested" in str(e)
+        assert raised, "callback exception must propagate out of generate()"