Introduction: A Dual Milestone for Anthropic
In a strategic move redefining the landscape of AI-assisted software development, Anthropic acquires Bun, the breakthrough JavaScript runtime known for its blistering speed. This announcement coincides with a massive financial achievement: Claude Code, the company's AI coding tool, has hit $1 billion in run-rate revenue just six months after its public release in May 2025.
The Meteoric Rise of Claude Code
Launched initially as an internal engineering experiment and released publicly in Spring 2025, Claude Code has quickly become an essential tool for developers and startups alike. Its adoption by industry giants such as Netflix, Spotify, KPMG, L’Oreal, and Salesforce highlights the model's ability to integrate into complex, enterprise-grade workflows.
Reaching $1 billion in revenue in such a short timeframe underscores the explosive demand for "agentic coding" solutions, where AI goes beyond code suggestions to act as an active partner in software construction.
Why Did Anthropic Acquire Bun?
Founded by Jarred Sumner in 2021, Bun is more than just a JavaScript runtime; it is an all-in-one toolkit combining a bundler, package manager, and test runner. With over 7 million monthly downloads and 82,000+ GitHub stars, Bun has distinguished itself by being dramatically faster than its competitors.
The acquisition aims to bake this velocity directly into Claude Code's infrastructure. The collaboration between the two teams had been ongoing for months, directly driving the launch of Claude Code's native installer. The goal is clear: to enhance reliability, reduce latency, and improve the overall experience for developers building applications with AI.
"Bun represents exactly the kind of technical excellence we want to bring into Anthropic. Jarred and his team rethought the entire JavaScript toolchain from first principles while remaining focused on real use cases."
Mike Krieger, Chief Product Officer at Anthropic
The Future of Bun: Open Source and MIT License
A primary concern for the developer community is often the fate of open-source projects post-acquisition. Anthropic has reassured the ecosystem: Bun will remain open source and keep its MIT license. The company plans to continue investing in Bun as an independent tool, aiming to make it the default choice for JavaScript and TypeScript developers, regardless of whether they use Claude.
For further technical details and official statements, you can read the original article by Anthropic.
FAQ: Anthropic, Bun, and Claude Code
What is Bun and why is it important for AI?
Bun is an incredibly fast, all-in-one toolkit for JavaScript and TypeScript. It is crucial for AI because it allows for building, testing, and deploying applications generated by models like Claude Code with unprecedented speed and efficiency.
Will Bun remain open source after the acquisition?
Yes, Anthropic has confirmed that Bun will remain open source under the MIT license and will continue to be developed as an independent tool for the community.
What does Claude Code reaching a $1 billion run-rate mean?
It means that, based on current revenue projected annually, Claude Code is generating $1 billion. This milestone was reached in November, just six months after its public launch.
Which companies are using Claude Code?
Major enterprise clients mentioned include industry leaders like Netflix, Spotify, Salesforce, KPMG, and L’Oreal, as well as innovative platforms like Midjourney.