---
license: other
license_name: minimax-h3-community-license-agreement
license_link: https://huggingface.co/MiniMaxAI/MiniMax-H3/blob/main/LICENSE
tags:
- comfyui
- nvfp4
- quantized
- video
- text-to-video
- minimax-h3
base_model: Comfy-Org/MiniMax-H3
base_model_relation: quantized
---

# MiniMax-H3 T2V (FL2VA) — NVFP4

NVFP4 quantization of the **MiniMax-H3 FL2VA/t2va** diffusion transformer for ComfyUI.
This is the **text-to-video** variant (prompt → video, with optional first/last-frame
conditioning) — the first NVFP4 T2V release of MiniMax-H3 (existing NVFP4 releases
covered only Ref2VA).

- Original model: https://huggingface.co/MiniMaxAI/MiniMax-H3
- ComfyUI repackage (bf16 source): https://huggingface.co/Comfy-Org/MiniMax-H3

## File

| file | size | notes |
|---|---|---|
| `diffusion_models/minimax_h3_fl2va_nvfp4_mixed.safetensors` | 24.4 GB | attn/mlp → NVFP4, adaln → FP8 (recommended) |

## Requirements

- **NVIDIA Blackwell GPU** (RTX 50-series, RTX PRO 6000, DGX Spark / GB10). On older
  GPUs the NVFP4 path is emulated — use Comfy-Org's `int8_convrot` files instead.
- **ComfyUI ≥ 0.30.0** with native MiniMax-H3 support (`comfy_extras/nodes_minimax_h3.py`).

## Usage

1. Place the file in `ComfyUI/models/diffusion_models/`
2. Load the `video_minimax_h3_r2v.json` workflow (or use `MiniMaxH3ImageToVideo` with no keyframes for pure T2V)
3. Suggested params: `res_multistep` sampler, frame length `17n + 5` (e.g. 22, 39, 56, 73), 20 steps, 864×480 test resolution

## Quantization profile (mixed)

- 200 attn/mlp layers → NVFP4 (Tensor Core)
- 50 adaln layers → FP8 (E4M3FN) — modulation path kept higher precision
- norms, biases, embedders, heads → BF16
- Converted with `comfy-kitchen` (`TensorCoreNVFP4Layout`) — per-layer `.comfy_quant` metadata, loadable natively by ComfyUI.

## Companion files

Also needed (from `Comfy-Org/MiniMax-H3`):
- `text_encoders/qwen3vl_32b_minimax_h3_nvfp4_awq.safetensors` (15.7 GB)
- `vae/minimax_h3_video_vae_fp16.safetensors` (5.2 GB)
- `vae/minimax_h3_audio_vae_fp32.safetensors` (0.6 GB)

## Bonus: uncensored ("Heretic") text encoder — NVFP4

Optional drop-in replacement for the standard MiniMax-H3 text encoder. Built from
`ethanfel/Qwen3-VL-32B-Ultra-Heretic-MiniMax-H3-ComfyUI-INT8-ConvRot` (itself derived from
`llmfan46/Qwen3-VL-32B-Instruct-ultra-uncensored-heretic`, abliterated with ARA edits on
`attn.o_proj` layers 31-40), then converted to NVFP4 with the same `.comfy_quant` format.

| file | size | notes |
|---|---|---|
| `text_encoders/qwen3vl_32b_minimax_h3_ultra_uncensored_heretic_nvfp4.safetensors` | 16.5 GB | language layers 0-49 + vision tower, 350 layers NVFP4, rest BF16 |

Usage: select it in `CLIPLoader` with type `minimax` (same as the standard encoder).
Source's INT8-only generation-tail (layers 50-63) is not included; the conditioning
path is identical to the standard MiniMax-H3 CLIP.

Abliteration reduces refusal behavior — test content for quality/appropriateness.