π0.5
Announced 2025-04-22; weights open-sourced Sept 2025 (pi05_base, pi05_libero, pi05_droid). Still the most capable open-weights PI model. Full fine-tuning needs >70 GB VRAM.
- Input
- text, image
- Output
- action, text
- License
- apache-2.0 (openpi code); weights built on PaliGemma, Gemma terms apply
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| GitHub (openpi, JAX + PyTorch) | gs://openpi-assets/checkpoints/pi05_base | github.com/Physical-Intelligence/openpi | — |
| Hugging Face (LeRobot port) | lerobot/pi05_base | huggingface.co/lerobot/pi05_base | docs |
Notable capabilities (3)
- Open-world generalization to unseen homes: Cleans kitchens and bedrooms in entirely new homes not in training; performance improved as training grew from 3 to 104 homes; co-trained on heterogeneous robot, web and verbal-instruction data. source
- Hierarchical subtask prediction + actions in one model: Predicts a high-level text subtask, then low-level actions; trained with knowledge insulation. source
- Newest open-weights π model (found after launch): Base plus LIBERO and DROID checkpoints released in openpi in September 2025; the latest PI model with public weights as of 2026-09 (π0.6/π0.7 are closed). source
Sources: π0.5 blog, openpi, LeRobot docs.
Other Physical Intelligence models
π0.7 · π0.6 / π*0.6 · π0-FAST · π0 (pi-zero)