Open-source toolkit: AI company Anthropic acquires Bun
AI company Anthropic has acquired the open-source JavaScript toolkit Bun, which it uses for the infrastructure of Claude Code.
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Bun has been acquired by Anthropic, as Bun creator Jarred Sumner announced on the Bun blog. The JavaScript toolkit, consisting of a runtime, bundler, test runner, and package manager, is intended to form the infrastructure for Anthropic's AI coding technologies Claude Code and Claude Agent SDK, as well as future AI coding projects.
Bun remains open source
According to Sumner's statements, Bun will continue to remain open source and MIT-licensed. The same team as before will continue to work on Bun, and development will continue to take place publicly on GitHub. The roadmap is to maintain the focus on performance and Node.js compatibility – and on replacing Node.js as the standard server-side runtime for JavaScript.
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Bun first appeared in July 2022, with the goal of becoming a "drop-in" replacement for Node.js even back then. Within the first week, the project achieved 20,000 GitHub stars, as the Bun creator recalls. The number has since risen to over 83,000 stars and, since version 1.3, presents itself as a full-stack JavaScript runtime.
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Acquisition by Anthropic
Anthropic's Claude Code, an agentic AI coding tool, runs with Bun, and over the past few months, the Bun team has been prioritizing issues from the Claude Code team. Following discussions with Anthropic, Bun, which itself had no revenue, is now being acquired: Anthropic buys Bun as essential infrastructure for Claude Code, the Claude Agent SDK tool collection, and future AI coding products.
As Sumner emphasizes, this step is intended to bring long-term stability to Bun. In addition, they now want to hire additional software engineers. According to Sumner, the two sides fit together naturally, because: "Bun started with a focus on making developers faster. AI coding tools do something similar."
(mai)
