Claude Code uses Bun written in Rust now

1 · · July 19, 2026, 4:35 a.m.
Summary
This blog post discusses the transition of Claude Code to utilizing Bun, rewritten in Rust. The author explores his observations regarding the software's performance improvements and the evidence supporting the implementation of Bun in production environments, while also emphasizing the 'boring' nature of this update as a positive outcome.