openpi (Physical Intelligence)

Physical Intelligence's open-source code and weights repository for its π-series VLA models.

openpi is the open-source code repository Physical Intelligence released on GitHub in 2025, providing pretrained weights along with inference and fine-tuning code for π0, π0-FAST, and the later π0.5, released under the Apache 2.0 license. The repository also includes fine-tuning examples on platforms such as DROID, ALOHA, and LIBERO, plus an inference server that lets a policy be called as a remote service. It lets teams without large-scale robot data of their own fine-tune an existing, capable VLA on their own data instead of starting from scratch, making it one of the most common starting points for VLA work today in both academia and startups.

ExamplePlug your own LeRobot-format data into openpi, fine-tune the π0.5 base model, and use its policy server to drive a real robot.

Related

π0 · π0-FAST · π0.5 · Physical Intelligence · LeRobot · Open-weight Model

Sources

Physical-Intelligence/openpi - GitHub

As of

2025-09