Claude Code adopts new unreleased Rust‑based version of Bun

Claude Code has switched to using the new, unreleased version of Bun. The updated Bun runtime is built in the Rust programming language. This change was announced in a tweet by Simon Willison. The move suggests a focus on performance and safety improvements. Bun’s Rust implementation may offer faster execution for Claude Code’s tasks. As the version is not yet publicly released, access may be limited to select users. The update reflects ongoing development within the Claude Code project. Observers will watch for performance gains and broader availability of the Rust‑based Bun.