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19 JUL 2026 · Simon Willison

Claude Code uses Bun written in Rust now

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. Boring is good. I decided t…

Rust Bun Claude Code