Pi0.5

Pi0.5 (pi0.5) is Physical Intelligence's vision-language-action (VLA) foundation model for generalist robot control, published in April 2025 as arXiv 2504.16054 (exact release day not confirmed). It upgrades the earlier pi0 with knowledge insulation, a technique aimed at the core robotics challenge of open-world generalization: performing tasks correctly in new settings with new objects, not just controlled lab environments.

Like the rest of the openpi family, pi0.5 shares a PaliGemma backbone, is pre-trained on 10,000+ hours of multi-platform robot data, and is released under Apache 2.0 with JAX and PyTorch implementations. Base checkpoints can be fine-tuned on custom tasks, with the PyTorch path workable on a single GPU, and LeRobot ships an adapted implementation (lerobot/pi05_base on Hugging Face).