Thoughts on OpenAI acquiring Astral and uv/ruff/ty

simonwillison.net

March 19, 2026

6 min read

🔥🔥🔥🔥🔥

48/100

Summary

OpenAI has acquired Astral, the company behind the open-source projects uv, ruff, and ty. The Astral team will integrate into OpenAI's Codex team.

Key Takeaways

OpenAI has acquired Astral, which is known for its open source projects uv, ruff, and ty, and the Astral team will join OpenAI's Codex team.
uv, Astral's primary project, has become a popular solution for Python's environment management, with over 126 million downloads in the last month.
OpenAI plans to continue supporting Astral's open source tools and leverage Astral's engineering expertise to enhance Codex and the software development lifecycle.
The acquisition raises concerns about the ownership of critical Python infrastructure, particularly with Astral's private package registry, pyx, being excluded from the acquisition announcements.