diff --git a/py/IMAGE_GPT2_apikey.py b/py/IMAGE_GPT2_apikey.py
index 83d7035..dd67dc9 100644
--- a/py/IMAGE_GPT2_apikey.py
+++ b/py/IMAGE_GPT2_apikey.py
@@ -61,6 +61,10 @@ class PDOpenAIGPTImage2APIKey:
                     "default": "1024x1024",
                     "tooltip": "Preset output size"
                 }),
+                "use_custom_size": ("BOOLEAN", {
+                    "default": False,
+                    "tooltip": "Enable custom_width/custom_height size override."
+                }),
                 "custom_width": ("INT", {
                     "default": 0,
                     "min": 0,
@@ -113,6 +117,7 @@ class PDOpenAIGPTImage2APIKey:
         quality,
         background,
         size,
+        use_custom_size,
         custom_width,
         custom_height,
         num_images,
@@ -127,7 +132,12 @@ class PDOpenAIGPTImage2APIKey:
             return (empty_image(), error_msg, "")
 
         try:
-            resolved_size = validate_gpt_image_2_size(size, custom_width, custom_height)
+            resolved_size = validate_gpt_image_2_size(
+                size,
+                custom_width,
+                custom_height,
+                use_custom_size=use_custom_size,
+            )
         except Exception as e:
             return (empty_image(), f"Error: {str(e)}", "")
 
@@ -191,7 +201,12 @@ class PDOpenAIGPTImage2APIKey:
             duration = time.time() - start_time
             min_cost, max_cost = estimate_price_range_2(quality, num_images)
             token_cost = calculate_token_price_2(num_images)
-            size_note = resolve_gpt_image_2_size(size, custom_width, custom_height)
+            size_note = resolve_gpt_image_2_size(
+                size,
+                custom_width,
+                custom_height,
+                use_custom_size=use_custom_size,
+            )
             exact_cost = calculate_exact_cost_gpt_image_2_from_usage(result)
 
             mode_label = "编辑" if is_edit_mode else "生成"
diff --git a/py/IMAGE_GPT2_authtoken.py b/py/IMAGE_GPT2_authtoken.py
index 257571e..8349cb8 100644
--- a/py/IMAGE_GPT2_authtoken.py
+++ b/py/IMAGE_GPT2_authtoken.py
@@ -55,6 +55,10 @@ class PDOpenAIGPTImage2AuthToken:
                     "default": "1024x1024",
                     "tooltip": "Preset output size"
                 }),
+                "use_custom_size": ("BOOLEAN", {
+                    "default": False,
+                    "tooltip": "Enable custom_width/custom_height size override."
+                }),
                 "custom_width": ("INT", {
                     "default": 0,
                     "min": 0,
@@ -105,6 +109,7 @@ class PDOpenAIGPTImage2AuthToken:
         quality,
         background,
         size,
+        use_custom_size,
         custom_width,
         custom_height,
         num_images,
@@ -120,7 +125,12 @@ class PDOpenAIGPTImage2AuthToken:
             return (empty_image(), error_msg, "")
 
         try:
-            resolved_size = validate_gpt_image_2_size(size, custom_width, custom_height)
+            resolved_size = validate_gpt_image_2_size(
+                size,
+                custom_width,
+                custom_height,
+                use_custom_size=use_custom_size,
+            )
         except Exception as e:
             return (empty_image(), f"Error: {str(e)}", "")
 
@@ -187,7 +197,12 @@ class PDOpenAIGPTImage2AuthToken:
             duration = time.time() - start_time
             min_cost, max_cost = estimate_price_range_2(quality, num_images)
             token_cost = calculate_token_price_2(num_images)
-            size_note = resolve_gpt_image_2_size(size, custom_width, custom_height)
+            size_note = resolve_gpt_image_2_size(
+                size,
+                custom_width,
+                custom_height,
+                use_custom_size=use_custom_size,
+            )
             exact_cost = calculate_exact_cost_gpt_image_2_from_usage(result)
 
             mode_label = "编辑" if is_edit_mode else "生成"
diff --git a/py/_image_gpt_common.py b/py/_image_gpt_common.py
index d7e4bce..1a7bc2b 100644
--- a/py/_image_gpt_common.py
+++ b/py/_image_gpt_common.py
@@ -275,7 +275,40 @@ def calculate_token_price_2(n):
     return cost * n
 
 
-def resolve_gpt_image_2_size(size, custom_width, custom_height):
+def _custom_size_enabled(use_custom_size):
+    if isinstance(use_custom_size, str):
+        return use_custom_size.strip().lower() in ("true", "1", "yes", "on")
+    return bool(use_custom_size)
+
+
+def resolve_gpt_image_2_size(
+    size,
+    custom_width,
+    custom_height,
+    size_input=None,
+    width_input=None,
+    height_input=None,
+    use_custom_size=True,
+):
+    if not _custom_size_enabled(use_custom_size):
+        return size
+
+    if size_input is not None:
+        size_input = str(size_input).strip()
+        if size_input:
+            return size_input
+
+    if width_input is not None and height_input is not None:
+        try:
+            width_input = int(width_input)
+            height_input = int(height_input)
+        except (TypeError, ValueError):
+            width_input = 0
+            height_input = 0
+
+        if width_input > 0 and height_input > 0:
+            return f"{width_input}x{height_input}"
+
     if custom_width > 0 and custom_height > 0:
         return f"{custom_width}x{custom_height}"
     return size
@@ -326,8 +359,24 @@ def calculate_exact_cost_gpt_image_2_from_usage(result):
     }
 
 
-def validate_gpt_image_2_size(size, custom_width=0, custom_height=0):
-    resolved_size = resolve_gpt_image_2_size(size, custom_width, custom_height)
+def validate_gpt_image_2_size(
+    size,
+    custom_width=0,
+    custom_height=0,
+    size_input=None,
+    width_input=None,
+    height_input=None,
+    use_custom_size=True,
+):
+    resolved_size = resolve_gpt_image_2_size(
+        size,
+        custom_width,
+        custom_height,
+        size_input=size_input,
+        width_input=width_input,
+        height_input=height_input,
+        use_custom_size=use_custom_size,
+    )
     if resolved_size == "auto":
         return resolved_size