Anthropic's Claude Code CLI migrates to Bun runtime built with Rust
Anthropic's Claude Code command-line tool has switched to using Bun, a JavaScript runtime that is itself built with Rust. The change was noted by developer Simon Willison on his blog on July 19, 2026. The migration represents a notable shift in the underlying technology stack powering the AI coding assistant. The move to Bun, known for its speed and efficiency, may improve performance for Claude Code users. The news drew attention on Hacker News, garnering 47 points and 14 comments from the developer community.
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