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Claude Code uses Bun written in Rust now
Claude Code now embeds Bun's Rust rewrite.
About Claude Code uses Bun written in Rust now
Simon Willison investigates Jarred Sumner's claim that Claude Code now uses the Rust rewrite of Bun. By inspecting the installed binary, he finds evidence that Claude Code v2.1.181 and later ship with the Rust port, delivering faster startup while running across millions of devices.
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