OpenAI announced it will acquire Astral, a developer-focused startup behind some of the most widely adopted Python tooling in the industry. The move represents a significant escalation in OpenAI's strategy to embed development infrastructure into its Codex platform.
The acquisition brings three cornerstone tools under OpenAI's umbrella: Ruff, a blazing-fast Python linter and formatter; uv, a modern package manager; and ty, a type checking utility. These tools generate hundreds of millions of downloads monthly.
"Our goal with Codex is to move beyond AI that simply generates code and toward systems that can participate in the entire development workflow."
Our goal with Codex is to move beyond AI that simply generates code and toward systems that can participate in the entire development workflow, OpenAI stated. Since the start of 2026, Codex has experienced 3x user growth and 5x usage increase, now boasting more than 2 million weekly active users.
Charlie Marsh, Astral's founder, framed the deal as positioning the team at the frontier of AI and software. OpenAI has committed to maintaining Astral's open-source projects post-acquisition.
Developer Simon Willison highlighted a potential concern: One bad version of this deal would be if OpenAI start using their ownership of uv as leverage in their competition with Anthropic. The acquisition mirrors Anthropic's December 2025 purchase of Bun, suggesting leading AI companies view developer tool ownership as a critical pathway to market dominance.