Anthropic Chose Bun Over Node.js for Claude Code CLI: Here Is Why

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Anthropic built its agentic CLI coding assistant Claude Code on Bun rather than the conventional Node.js runtime. A key reason is startup speed: Bun launches in 5–15ms compared to Node's 50–80ms, reducing the perceived lag for a tool invoked repeatedly during development sessions. Bun also simplifies the build pipeline by bundling and compiling TypeScript into a self-contained binary in a single command, eliminating several steps typically required with Node.js tooling. Its package manager installs dependencies 10–25 times faster than npm, making global installs and updates noticeably quicker for end users. The choice reflects broader ecosystem signals that fast startup and streamlined tooling are increasingly prioritised for TypeScript-heavy CLI applications in 2025.

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