Anthropic has acquired Bun — a powerful JavaScript and TypeScript runtime tool — to strengthen its AI coding platform, Claude Code. Bun is known for its speed and efficiency, combining runtime, package manager, bundler, and test runner into a single tool.
With this acquisition, Anthropic aims to make Claude Code faster, more stable, and able to handle more complex coding tasks. Claude Code has become one of the fastest-growing AI developer tools, hitting a $1 billion annual run-rate just months after its public launch.
For developers, this means quicker code generation and testing, smoother workflows in JavaScript/TypeScript environments, and an improved experience using AI-powered coding assistants. Bun will continue as open source under MIT license, and its original team remains — now embedded within Anthropic.
In effect, Anthropic is building a full-stack AI-coding infrastructure: from runtime (Bun) to AI-assisted coding (Claude Code). This move may shift how modern software is built, making AI-driven programming more robust and mainstream.
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