ComfyUI LMStudio Remote Nodes

ComfyUI custom nodes to connect to a remote LMStudio server through the OpenAI API v1-compatible interface.

Included nodes

1. LMStudio - Connect

   • Server URL (example: http://10.168.168.7:1234)
   • API token (- placeholder supported)
   • Model dropdown (populated by Refresh Models button)
   • Test Connection button
   • Reasoning toggle
   • Advanced options (collapsed by default): max tokens, temperature, timeout, tooling/MCP toggle
   • Outputs a reusable LMSTUDIO_CONNECTION payload

2. LMStudio - Text Gen

   • Connection input from LMStudio - Connect
   • System prompt (LM Souls style)
   • User prompt
   • Seed (-1 = secure random)

3. LMStudio - Image To Text

   • Connection input from LMStudio - Connect
   • Image input
   • System prompt (LM Souls style)
   • User prompt
   • Seed (-1 = secure random)

Project structure

comfyui-lmstudio-node/
├── __init__.py               # Comfy extension entrypoint
├── connect_node.py           # Connection node schema + payload builder
├── text_gen_node.py          # Text generation node
├── image_to_text_node.py     # Image-to-text node
├── client.py                 # OpenAI SDK client + shared helpers
├── models.py                 # Dataclasses for connection payload
├── iotypes.py                # Custom Comfy IO types
├── routes.py                 # Backend routes for model list + connectivity test
├── web/
│   └── lmstudio_connect.js   # Frontend buttons for refresh/test and dropdown update
├── tests/                    # Unit tests
├── requirements.txt
└── pyproject.toml

Behavior and reliability notes

• Uses only the openai Python SDK. No legacy HTTP fallback path.
• Seed handling is sanitized and deterministic-safe; no random.seed() calls are used.
• Text and image nodes use responses endpoint first, then fallback to chat.completions if needed.
• MCP/tooling toggle is preserved in connection payload. It is useful only when your LMStudio model/session is configured for tool-capable responses.

Installation

1. Place this folder under ComfyUI/custom_nodes/.
2. Install dependencies:

   pip install -r requirements.txt
   

3. Restart ComfyUI.

LMStudio compatibility references

• LMStudio OpenAI compatibility docs
• ComfyUI custom node docs