Claude Code hits $1 billion in annual recurring revenue; Anthropic acquires JavaScript runtime "Bun"
On December 3, 2025, Anthropic simultaneously announced that Claude Code’s annual recurring revenue (ARR) had reached the $1 billion mark, and that it had acquired the JavaScript/TypeScript runtime “Bun.” Reaching $1 billion in just half a year since general availability began in May 2025 is considered an unusually fast pace for enterprise software.
Details
- Reaching $1 billion ARR: Achieved roughly six months after general availability launched in May 2025, driven by broadening adoption among major companies including Netflix, Spotify, KPMG, L’Oréal, and Salesforce
- The Bun acquisition: Acquired “Bun,” a JavaScript/TypeScript runtime founded by Jarred Sumner in 2021. An all-in-one toolkit combining a runtime, package manager, bundler, and test runner, boasting more than 7 million downloads a month and over 82,000 GitHub stars
- Existing adopters: Companies such as Midjourney and Lovable have a track record of adopting Bun
- Post-acquisition plans: Bun will remain open source under the MIT license, and Anthropic pledged to keep developing it so it stays the “JavaScript/TypeScript runtime of choice” for developers
- Rationale: Aimed at strengthening Claude Code’s infrastructure and performance. Chief Product Officer Mike Krieger said this reflects both a pursuit of technical excellence and part of the infrastructure build-out needed to support exponentially growing AI usage
What happened next
Claude Code’s growth kept accelerating afterward, with ARR continuing to climb into 2026. That a single product which started in a terminal grew into a major pillar of Anthropic’s overall revenue became emblematic of agentic coding tools moving from the experimental stage into essential enterprise infrastructure.