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Claude Code uses Bun rewritten in Rust
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Claude Code is running an unreleased version of Bun that has been rewritten in Rust, giving early access to the new implementation before its public release. Cat Wu and Thariq Shihipar from the Claude Code team discussed the technical details in a recent interview.
- Claude Code users are running Bun's Rust rewrite before official release
- Cat Wu and Thariq Shihipar (Claude Code team) gave interview at AI Engineer World's Fair
- Simon Willison published annotated transcript with verification commands to detect Rust Bun
- Bun rewrite represents shift from original JavaScript implementation to Rust
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Claude Code uses Bun written in Rust now
[BSKY]bluesky2
I interviewed Cat Wu and Thariq Shihipar from the Claude Code team at the AI engineer World's Fair a couple of weeks ago - the video is now out, so I've published an annotated transcript of our conversation simonwillison.net/2026/Jul/21/.…
If you have Claude Code installed you're running software that uses the new (unreleased) version of Bun that's been rewritten in Rust - here are two commands you can run to see that for yourself simonwillison.net/2026/Jul/19/...