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PhyAI (pronounced "phi") is a latency-first serving engine for Physical AI. It is designed first for latency critical workloads, such as policy and action models that run in interactive systems.

News

• [2026/07] 🚀 Support Cosmos3-Super (TP + CFG parallel) in the Cosmos3 WN generation path.
• [2026/06] 🚀 Support Pi0.5 and Cosmos3-Nano's policy mode & gen mode.

Installation

See the PhyAI installation guide for the latest source and nightly package instructions.

From source:

git clone https://github.com/MEmbodied/phyai
cd phyai
uv sync

Nightly build:

uv pip install phyai phyai-ext \
  --extra-index-url https://membodied.github.io/phyai/simple/ \
  --prerelease=allow

Citation

If you use PhyAI in research or production work, please cite the project:

@software{phyai2026,
  title = {PhyAI: Latency-First Serving Engine for Physical AI},
  author = {{PhyAI Team}},
  year = {2026},
  url = {https://github.com/MEmbodied/phyai}
}

License

PhyAI is released under the MIT License.

Notice

PhyAI is under active development. APIs, package layout, and deployment paths may change before stable releases.

PhyAI is grateful for excellent open-source implementations from the community, including SGLang and LeRobot. When using, modifying, or redistributing PhyAI, keep the relevant attribution and comply with applicable upstream license and notice requirements.