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openpi vs ray

openpi and ray share 10 technologies: Rich, jax, flax, torch, einops, transformers, orbax-checkpoint, sentencepiece, imageio, and pillow. Both are written in Python.

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What they share and what sets them apart

Physical-Intelligence

openpi

Python14.6kRead on November 9, 2026, at commit 215abfbWhat is openpi built with?

Only in openpi

In common

ray-project

ray

Ray is an AI compute engine. Ray consists of a core distributed runtime and a set of AI Libraries for accelerating ML workloads.

Python44.3kRead on November 13, 2026, at commit de4c576What is ray built with?

Only in ray

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
openpi17,200 lines written52 code files
ray1,566,356 lines written2,810 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
openpi0.7% of its commits signed by AIWith Claude Code
ray3.7% of its commits signed by AIWith Claude Code, Gemini CLI, GitHub Copilot, Cursor, and Codex
ActivityFrom GitHub and its history, on the day SeeRepo read it.
openpiLast push August 24, 2026150 commits14,578 stars
rayLast push November 13, 202632,468 commits44,282 stars
TestsThe files that test the code, and the share of code files a test imports.
openpi14 test files26.9% of its code files have a test that imports them
ray2,208 test files9.4% of its code files have a test that imports them

Frequently asked questions

Which is bigger, openpi or ray?
ray, with 1,566,356 lines written; openpi has 17,200.

The proof: ray-project/ray's code at commit de4c576

Which has more GitHub stars, openpi or ray?
ray, with 44,282 stars; openpi has 14,578.

The proof: ray-project/ray on GitHub

Which has more tests, openpi or ray?
ray, with 2,208 test files; openpi has 14.

The proof: ray-project/ray's code at commit de4c576

Which was updated more recently, openpi or ray?
ray: its last push was on November 13, 2026, and openpi's on August 24, 2026.

The proof: ray-project/ray's commits on GitHub

Which has more commits signed by AI, openpi or ray?
ray: an AI signed 3.7% of its commits, with Claude Code, Gemini CLI, GitHub Copilot, Cursor, and Codex; in openpi, 0.7%.

The proof: the commits each tool signed in ray-project/ray

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