LongCat-Video for B200

LongCat-Video generates videos.

Fork

The original upstream code does not run on the Nvidia B200 GPU. This fork updates and optimizes the code to run on the B200. Updates include:

• Python 3.12.
• Torch 2.11.
• CUDA 13.
• Flash Attention 4.
• Add Shell script wrappers for demos.
• Use 720p, not 480p, for demo scripts.
• Add 25 FPS demo scripts.
• Add 25 FPS demo scripts for avatars with refinements.
• Model download script.
• Bug fixes.
• Cleanups.
• Formatting.

Install

Quick and dirty install, flavor to taste:

mkdir -p ~/devel
cd ~/devel/
git clone https://spacecruft.org/movies/LongCat-Video-B200
cd LongCat-Video-B200/
export CUDA_HOME=/usr/local/cuda-13.2
export PATH=$CUDA_HOME/bin:$PATH
export LD_LIBRARY_PATH=$CUDA_HOME/lib64:$LD_LIBRARY_PATH
export TORCH_CUDA_ARCH_LIST="10.0"
python -m venv venv
source venv/bin/activate
pip install -U setuptools pip wheel
pip install torch==2.11.0+cu130 torchvision torchaudio torchcodec --index-url https://download.pytorch.org/whl/cu130
mkdir -p ~/devel/Dao-AILab
cd ~/devel/Dao-AILab
git clone https://github.com/Dao-AILab/flash-attention.git
cd flash-attention/flash_attn/cute/
pip install psutil
pip install -e ".[cu13]"
cd ~/devel/LongCat-Video-B200/
pip install -r requirements.txt
pip install -r requirements_avatar.txt

Upstream

Originally by the fine folks at MeiGen-AI.

See README-upstream.md for the upstream README.

Upstream license MIT.

Copyright © 2025 Meituan.

This fork is unrelated to the upstream project.

• https://github.com/meituan-longcat/LongCat-Video

• https://github.com/MeiGen-AI/LongCat-Video-Avatar

• https://huggingface.co/meituan-longcat/LongCat-Video

• https://huggingface.co/meituan-longcat/LongCat-Video-Avatar

• https://meigen-ai.github.io/LongCat-Video-Avatar/

License

MIT. See LICENSE.

Copyright © 2026 Jeff Moe.

Loveland, Colorado, USA