An unofficial ComfyUI port of the FastH3 4-Step Preview LoRA.
Sources
Conversion recipe (as recorded in the source metadata):
format = pt
source_format = Diffusers PEFT LoRA
target_format = ComfyUI generic LoRA
qkv_fusion = block diagonal B; concat A; alpha multiplied by 3
training_rank = 128
training_scale = 1.0
training_alpha = 128.0
swi_glu_mapping = Diffusers [value;gate] -> ComfyUI [gate;value]
base_model = Comfy-Org/MiniMax-H3 minimax_h3_fl2va_bf16.safetensors
Compatibility
✅ I2V and T2V — working on the MiniMax H3 FL2VA model (I2V 1- and T2V 2-sample videos)
⚠️ Ref2VA — partially working, but loses significant prompt adherence; an official release is recommended
Examples are made on default minimax workflow, 4 steps, Larryvrh turbo sampler
8ish steps making sound better in my own experience.
Workflows are imbedded in the videos.
Credits
All credit for the original model and the conversion recipe belongs to the original authors:
This conversion is an independent, unofficial effort and is not affiliated with, endorsed by, or sponsored by FastVideo, lightx2v, or ModelTC.
Right now I know about an experimental checkpoint by Kijai, would love to hear the difference from users.
https://huggingface.co/Kijai/MiniMax-H3-experimental/tree/main
