Pi-Zero

Pi-Zero (π0), announced by Physical Intelligence on October 31, 2024, is a general-purpose vision-language-action model for robot control and the first robot foundation model released open-source. It pairs a 3B PaliGemma vision-language backbone with a 300M-parameter flow-matching action expert, generating 50 motor commands per second for dexterous manipulation across 8 robot platforms — single arms, bimanual setups, and mobile manipulators. The company open-sourced weights, training code, and the openpi repository, with Hugging Face providing a PyTorch port; 1–20 hours of demonstration data suffices to fine-tune it to new tasks like folding laundry or clearing tables.

Limitations: real-robot deployment still needs embodiment-specific tuning and safety engineering — this is a research platform, not a turnkey product. The base model predates the company's later pi0.5/pi0.7 releases, which improved generalization substantially.