---
license: other
license_name: minimax-h3-community-license-agreement
license_link: https://huggingface.co/MiniMaxAI/MiniMax-H3/blob/main/LICENSE
tags:
- comfyui
- diffusion-single-file
base_model:
- MiniMaxAI/MiniMax-H3
- FastVideo/FastVideo-FastH3-Trim-8-Step
---

# 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
```