OpenAI buys Astral, the creators of uv and ruff, to build out Codex

OpenAI has announced the acquisition of Astral, the developer of two of the most popular tools in today's Python community: the uv package manager and the ruff linter. The deal is intended to speed up development of the Codex platform and create the next generation of tools for AI-assisted development.

Astral was founded by Charlie Marsh and in a short time became one of the most significant players in the Python ecosystem. The company's flagship product, uv, is a package manager and dependency resolver written in Rust that runs 10–100 times faster than standard pip. The second tool, ruff, has replaced a whole zoo of Python linters, including flake8, isort, pyupgrade and dozens of others, combining their functionality at a speed comparable to compiled languages. Today ruff has more than 60 million downloads per month.

OpenAI will fold the Astral team into the Codex division, the platform for autonomous code writing built on the o3 model. Codex can clone repositories, install dependencies, run tests and make commits without developer involvement. This is where Astral's tools become a strategic asset: the speed of package installation and static code analysis is critical when an AI agent handles hundreds of tasks in parallel.

Notably, both tools will remain open source under the MIT license. Charlie Marsh stressed that the team will keep developing uv and ruff at the same pace, but now with OpenAI's resources. That means independent developers and corporate teams will still be able to use the tools for free.

The Astral acquisition fits a broader trend: leading AI companies are actively buying up developer infrastructure tooling. Microsoft bought GitHub in 2018, which directly fed GitHub Copilot. Now OpenAI is making a similar move, but at the level of the low-level Python stack.

For the Python community, the news is mixed. On one hand, Astral gets funding and the chance to move faster. On the other, critical infrastructure is passing under the control of a commercial company with its own interests in AI coding. The question of the tools' long-term neutrality remains open.

One thing is clear: OpenAI is deliberately building a vertically integrated stack for AI developers, from language models to package managers. The Astral acquisition makes Codex not just an AI assistant but a full development environment with its own infrastructure.