HyperFlow H3 Flash is an open 14B few-step version of MiniMax H3 that runs in ComfyUI on home GPUs
Video Rebirth released HyperFlow H3 Flash, a compressed 14B version of MiniMax H3 that makes video with stereo sound in 4 to 8 steps. GGUF files from 7.2 GB run in ComfyUI on 24 GB and 32 GB RTX cards.
What it does
Makes 5.2 to 15 second clips at 24 fps (1344×768 by default) with a 32 kHz stereo soundtrack, from text, from a first frame (or first and last frame), or from up to 12 reference images. It samples in 4, 6 or 8 steps without CFG, 6 by default. The model is 13.7B or 13.9B parameters, less than half the ~31B MiniMax H3 transformer.
Results and limits
Video Rebirth's model card lists a 5.2 s clip at 6 steps taking 92 s on an RTX 5090, 36 s on one H200 and 8.7 s on 4× B200. The Q4_K_M GGUF is 9.1 GB and is the recommended default for 24 GB GPUs; 16 GB GPUs are not measured yet.
Worth knowing
It carries the MiniMax H3 Community License, which does not cover use in the EU, UK, South Korea or the US without permission from MiniMax. ComfyUI needs the ComfyUI-GGUF and ComfyUI-HyperFlow-Flash custom nodes plus the shared H3 text encoder and VAEs from Comfy-Org/MiniMax-H3; on 16 GB or 32 GB RAM PCs start ComfyUI with --fast-disk. NVIDIA's SOL-H3 engine supports it from day one.