Anthropic acquires JavaScript runtime Bun, Claude Code hits $1B revenue

Anthropic announced it is acquiring Bun, a JavaScript runtime company, as its Claude Code product reached $1 billion in run-rate revenue six months after becoming publicly available in May 2025.

Bun, founded by Jarred Sumner in 2021, provides a JavaScript runtime that functions as an all-in-one toolkit combining runtime, package manager, bundler, and test runner capabilities. The company reports its software has been downloaded more than 7 million times and has over 82,000 stars on GitHub.

Claude Code serves enterprise clients including Netflix, Spotify, KPMG, L'Oreal, and Salesforce. The product evolved from an internal engineering experiment to reach its revenue milestone in November 2025, according to the company's press release.

"Bun represents exactly the kind of technical excellence we want to bring into Anthropic," said Mike Krieger, Chief Product Officer of Anthropic. "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."

Anthropic stated that Bun has been a partner for several months and contributed to Claude Code's infrastructure scaling and the launch of Claude Code's native installer. The acquisition aims to enhance performance and stability for Claude Code users.

The company said Bun will remain open source under its MIT license following the acquisition. Companies including Midjourney and Lovable currently use Bun's technology.

Financial terms of the acquisition were not disclosed in the announcement.

You May Also Be Interested In

• Chipotle tries to get ahead of a potential activist problem - Semafor
• Boeing Close To Finalising Order For 150 Max Jets To Turkish Airlines After Engine Maintenance Dispute Resolved, Sources Say - Reuters
• TXNM Energy and Blackstone revise merger offer with $300M benefit package