## Claude Code Switches to Bun, Built with Rust

Claude Code Switches to Bun, Built with Rust

Claude Code now runs on Bun. Bun is a JavaScript runtime written in Rust. The change makes the tool faster and more reliable. Rust gives low‑level control and strong safety guarantees. The result is smoother code generation and quicker response times.

The move also simplifies deployment. Bun’s single‑binary design reduces the number of dependencies. Developers can start Claude Code with a single command:

bun run claude-code.js

Under the hood, the Rust core handles the heavy lifting. This improves memory usage and lowers latency. The update is described in detail on the original post: Claude Code uses Bun written in Rust now.