H3 MiniMax H3 / ComfyUI
Official & Community ComfyUI Node Setup

MiniMax H3 ComfyUI Workflow:
Download JSON & Setup Guide

Execute MiniMax H3 unified video & stereo audio sampling locally or via cloud instances. Download tested Text-to-Video (T2V) and Image-to-Video (I2V) workflow JSON files, configure low VRAM offloading, and set up custom node dependencies.

Download Workflow JSON VRAM & Hardware Guide
01 / Tested Templates

ComfyUI Workflow JSON Files

Text-To-Video (T2V)

MiniMax H3 Text-to-Video + Native Audio Workflow

{
  "last_node_id": 12,
  "last_link_id": 16,
  "nodes": [
    {
      "id": 1,
      "type": "MiniMaxH3Loader",
      "pos": [100, 150],
      "outputs": [{"name": "MODEL", "type": "MODEL"}, {"name": "CLIP", "type": "CLIP"}],
      "widgets_values": ["minimax_h3_fp16.safetensors", "cuda", "fp16"]
    },
    {
      "id": 2,
      "type": "CLIPTextEncode",
      "pos": [380, 150],
      "widgets_values": ["SUBJECT: Cyberpunk neon street under heavy rain. ACTION: Pan camera smoothly right. AUDIO: Rain splashing with stereo synth music. PRESERVE: Street atmosphere. AVOID: Blurry flickering."]
    },
    {
      "id": 3,
      "type": "MiniMaxSampler",
      "pos": [700, 150],
      "widgets_values": [30, 7.5, "euler_ancestral", "normal", 1024, 576, 120]
    },
    {
      "id": 4,
      "type": "MiniMaxAudioSyncDecode",
      "pos": [1020, 150],
      "widgets_values": ["stereo_48khz", true]
    },
    {
      "id": 5,
      "type": "VHS_VideoCombine",
      "pos": [1320, 150],
      "widgets_values": ["video/h264-mp4", 24, true]
    }
  ]
}
Image-To-Video (I2V)

MiniMax H3 Image-to-Video Character Consistency Workflow

{
  "last_node_id": 14,
  "last_link_id": 19,
  "nodes": [
    {
      "id": 1,
      "type": "LoadImage",
      "pos": [80, 200],
      "widgets_values": ["character_portrait_reference.png"]
    },
    {
      "id": 2,
      "type": "MiniMaxH3I2VLoader",
      "pos": [360, 200],
      "widgets_values": ["minimax_h3_i2v_fp16.safetensors", "enable_identity_preservation"]
    },
    {
      "id": 3,
      "type": "CLIPTextEncode",
      "pos": [680, 200],
      "widgets_values": ["SUBJECT: Character defined by Image 1. ACTION: Subject smiles gently and turns head 30 degrees left. PRESERVE: Face identity, clothing texture, hair color from Image 1."]
    },
    {
      "id": 4,
      "type": "MiniMaxKSamplerI2V",
      "pos": [1000, 200],
      "widgets_values": [28, 6.8, "dpmpp_2m", "karras", 1.0]
    },
    {
      "id": 5,
      "type": "VHS_VideoCombine",
      "pos": [1320, 200],
      "widgets_values": ["video/h264-mp4", 24, true]
    }
  ]
}
02 / System Requirements

VRAM & Hardware Specifications for ComfyUI

Running MiniMax H3 locally requires understanding GPU memory allocation. Depending on your Nvidia RTX graphics card, apply the optimal command line flags during ComfyUI startup.

VRAM Capacity Recommended GPU Startup Flag Resolution & Performance
12 GB VRAM Nvidia RTX 3060 / 4060 12GB --lowvram --fp8_e4m3fn 720p at ~45-60s per clip (CPU offloading enabled)
16 GB VRAM Nvidia RTX 4070 Ti / 3080 16GB --medvram 1080p full speed, concurrent audio decode
24 GB+ VRAM Nvidia RTX 3090 / 4090 / A6000 --highvram (Default) 2K Native output, ultra-fast sampling speed

01 / Install Custom Nodes

Open ComfyUI-Manager, search for ComfyUI-MiniMax-H3 or ComfyUI-VideoHelperSuite (VHS), and click Install.

02 / Place Model Checkpoints

Move downloaded .safetensors model weights to ComfyUI/models/checkpoints/ or ComfyUI/models/diffusers/.

03 / Drag & Drop Workflow

Simply download our .json workflow template above and drag it onto your browser canvas to auto-load all node links.

03 / FAQ

Frequently Asked Questions

What is the minimum VRAM required for MiniMax H3 in ComfyUI?

12GB VRAM is the minimum required with the --lowvram flag enabled. For smooth 2K generation without CPU RAM offloading, 24GB VRAM (such as RTX 3090/4090) is recommended.

How do I fix CUDA Out of Memory (OOM) errors in ComfyUI?

Start ComfyUI using python main.py --lowvram --precision fp16. Ensure you lower the batch latent image size to 1024x576 during initial sampling tests.

Does MiniMax H3 support quantized GGUF models in ComfyUI?

As of August 2026, community GGUF node support is in experimental testing. For stability, use official FP16 or FP8 safetensors models.

Where can I find additional MiniMax H3 workflow community discussions?

Check the active threads on r/ComfyUI and r/StableDiffusion on Reddit, or visit official GitHub repositories linked in our local install guide.