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simon_willison · Jul 19, 2026 · news
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Claude Code uses Bun written in Rust now
simonwillison.netJul 19, 2026
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In brief
In Rewriting Bun in Rust Jarred Sumner made the following claim: Claude Code v2.1.181 (released June 17th) and later use the Rust port of Bun. Startup got 10% faster on Linux but otherwise, barely anyone noticed. Bori...
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