FastVideo/FastVideo-FastH3-Trim-Comfy

FastVideo FastH3 Trim

Repackaged model files for ComfyUI.

Original model repository: https://huggingface.co/FastVideo/FastVideo-FastH3-Trim-8-Step

FastH3 Trim is an experimental pruned FastH3 model: 42 transformer blocks instead of 50 and a rank-16 timestep conditioning, sampled in 8 steps. It is 4.2× smaller than base H3 and faster than FastH3 V2.

Use the FastVideo FastH3: Text to Video template (ComfyUI 0.36.0 or later) and pick one of the files below in its UNETLoader. Keep the template's sampler settings: 8 steps, res_multistep, simple, and the MiniMaxH3SigmaShift node at 10 (video) and 3 (audio).

Diffusion model	Size	Use it on
fastvideo_fasth3_trim_8step_nvfp4.safetensors	11.9 GB	NVIDIA Blackwell: RTX 50 series, RTX PRO 6000, DGX Spark
fastvideo_fasth3_trim_8step_fp8.safetensors	19.7 GB	NVIDIA Ada and newer: RTX 40 series
fastvideo_fasth3_trim_8step_int8_convrot.safetensors	18.9 GB	Any recent NVIDIA GPU; matches the template's default format
fastvideo_fasth3_trim_8step_bf16.safetensors	37.5 GB	Reference quality, or for converting to other formats

Place the files in the following folders:

📂 ComfyUI/
└── 📂 models/
    ├── 📂 diffusion_models/
    │   ├── fastvideo_fasth3_trim_8step_bf16.safetensors
    │   ├── fastvideo_fasth3_trim_8step_fp8.safetensors
    │   ├── fastvideo_fasth3_trim_8step_int8_convrot.safetensors
    │   └── fastvideo_fasth3_trim_8step_nvfp4.safetensors
    ├── 📂 text_encoders/
    │   ├── qwen3vl_32b_minimax_h3_bf16.safetensors
    │   ├── qwen3vl_32b_minimax_h3_int8_convrot.safetensors
    │   └── qwen3vl_32b_minimax_h3_nvfp4_awq.safetensors
    ├── 📂 vae/
    │   ├── minimax_h3_audio_vae_fp32.safetensors
    │   ├── minimax_h3_video_vae_fp16.safetensors
    │   └── minimax_h3_video_vae_int8_convrot.safetensors