2 minute read | December.03.2025
Anthropic, a leading AI safety and research company, is acquiring Bun, a high-performance JavaScript runtime.
Orrick advised Anthropic.
Anthropic is an AI safety and research company dedicated to building reliable, interpretable and steerable AI systems. Its flagship product, Claude, is trusted by enterprises and developers worldwide.
Bun is a breakthrough JavaScript runtime. As an all-in-one toolkit—combining runtime, package manager, bundler and test runner—it has become essential infrastructure for AI-led software engineering, helping developers build and test applications at unprecedented velocity.
The transaction marks a significant step in Anthropic’s mission to advance the capabilities of Claude, its flagship AI assistant, and follows the recent milestone of Claude Code reaching $1 billion in run-rate revenue.
"Bun represents exactly the kind of technical excellence we want to bring into Anthropic," said Mike Krieger, Chief Product Officer of Anthropic. "Jarred and his team rethought the entire JavaScript toolchain from first principles while remaining focused on real use cases. Claude Code reached $1 billion in run-rate revenue in only 6 months, and bringing the Bun team into Anthropic means we can build the infrastructure to compound that momentum and keep pace with the exponential growth in AI adoption."
Bun has improved the JavaScript and TypeScript developer experience by optimizing for reliability, speed and delight. For those using Claude Code, this acquisition means faster performance, improved stability and new capabilities.
The deal team advising Anthropic was led by Mark Seneca, Kyle Zhu, Matthew Sawyer and Hilary Finkelstein and by Stephen Venuto, Laura Barr and Jay Schau, with invaluable support from Christine McCarthy, Katherine Hogan, Sharon Zhou, Christina Bouchot, Lisa Bowman, Steven Malvey, Daniel Yost, Taylor Ranfos, Nicholas Farnsworth, Shannon Yavorsky, Carly Owens, Amy Ray, Victoria Newbold, Kristin Petersen, Allen Davis, Jeanine McGuinness, Allison Bradham and Deborah Abernathy.