MiniMax H3 Community Quants: GGUF, INT4, and NVFP4 for Consumer GPUs
Community quantizations of MiniMax H3 hit Hugging Face the day after open weights: GGUF Q2-Q5, pruned INT4/INT8, and NVFP4 files with bundled ComfyUI workflows.
Community quantizations of MiniMax H3 started landing on Hugging Face the day after the open-weights release, packing the 33.1B omni-modal video model into sizes that fit consumer GPUs. Four repositories shipped on August 3, covering GGUF Q2-Q5, pruned INT4/INT8, and NVFP4 formats, most with bundled ComfyUI workflows.
The open-weights release itself arrived August 3 with native ComfyUI support (read the open-weights story). The official Comfy-Org repack covers bf16, INT8, and pruned INT8 files, but the community quantization wave goes further: GGUF weights that work with ComfyUI's GGUF loaders, INT4 files around 11-12 GB, and NVFP4 variants for Blackwell GPUs.
A frame from the sample video bundled in Abiray's MiniMax-H3-GGUF repository
What shipped
| Repository | Format | Highlights |
|---|---|---|
| Abiray/MiniMax-H3-GGUF | GGUF | FL2VA + Ref2VA in Q3_K_M/S, Q4_0, Q4_K_M/S, Q5_0, Q5_K_M/S (15.6-23.9 GB); GGUF, INT4, and NVFP4 text encoders; bundled FL2V workflow |
| realrebelai/MiniMax-H3_GGUFs | GGUF | FL2VA + Ref2VA in Q2_K mixed precision, Q3_K_M, Q4_K_M; Q2_K and Q4_K_M text encoder GGUFs; FL2V/Ref2V workflows |
| Abiray/Minimax-H3-nvfp4-INT4-INT8-Convrot | INT4 / INT8 / NVFP4 | Pruned INT4 (~11.3 GB), mixed INT4/INT8 (~15.5 GB), INT8 (~21 GB), NVFP4 (12.5 GB) with a per-GPU selection guide |
| lilcheaty/MiniMax-H3-NVFP4 | NVFP4 | FL2VA and Ref2VA NVFP4 pruned/full/mixed variants with ComfyUI profile JSONs |
Fitting H3 on your GPU
The quantization repos organize their files around the GPU you have:
| GPU | Recommended files |
|---|---|
| 16 GB VRAM (RTX 4070 Ti Super, RTX 4080) | GGUF Q3/Q4 or pruned INT4 / mixed INT4-INT8 diffusion model + INT4 text encoder |
| 24 GB VRAM (RTX 3090, RTX 4090) | GGUF Q5 or pruned INT8 diffusion model + INT8 text encoder |
| Blackwell (RTX 5090, PRO 6000) | NVFP4 pruned diffusion model + NVFP4 AWQ text encoder |
Everyone still needs both VAEs: minimax_h3_video_vae_fp16.safetensors and minimax_h3_audio_vae_fp32.safetensors.
Sample output
Sample video bundled with the MiniMax-H3-GGUF repository
ComfyUI workflows
The GGUF repositories ship ready-made workflows. Abiray's repository includes minimax_fl2v_gguf_workflow.json for text-to-video with the quantized FL2VA model:
For the official bf16/INT8 workflows from Comfy-Org, see the open-weights article or the built-in template gallery (video_minimax_h3_t2v, video_minimax_h3_i2v, video_minimax_h3_r2v).
Availability
- Abiray/MiniMax-H3-GGUF — Hugging Face, GGUF Q3-Q5 for FL2VA and Ref2VA
- realrebelai/MiniMax-H3_GGUFs — Hugging Face, GGUF Q2-Q4 with workflows
- Abiray/Minimax-H3-nvfp4-INT4-INT8-Convrot — Hugging Face, pruned INT4/INT8/NVFP4
- lilcheaty/MiniMax-H3-NVFP4 — Hugging Face, NVFP4 variants
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