STORY · VERKTOY_
Claude Code now runs Bun written in Rust
Anthropic has integrated the Rust version of Bun into Claude Code from version 2.1.181. Simon Willison verified this by analyzing the Claude Code binary and found both Bun v1.4.0 and 563 Rust source filenames, confirming that the new Rust implementation is running in production on millions of devices.
WHY IT MATTERS
This demonstrates that Bun as a build system and runtime is being made production-ready through heavy use in a larger application. It represents a success story for Rust-based JavaScript tools replacing C++ implementations with potential performance and maintenance benefits.
SOURCES
MACHINE-GENERATED SUMMARY This summary is written by machine from the sources below. We sort and explain — but we are a way into the field, not the final word. Check the source when something matters to you.