Claim◆Article
The combined evidence confirms that Bun's Rust rewrite is genuinely running in production on millions of devices via Claude Code, quietly and without fanfare.
The author concludes that the strings evidence proves Bun-in-Rust is live in production at massive scale through Claude Code, echoing Sumner's 'boring is good' framing. ✦ AI generated
Simon Willison · Simon Willison's Weblog · 2026-07-19 · original ↗
It looks like Bun in Rust is indeed being run in production across millions of different devices. Like Jarred said, "Boring is good".
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- ·Strings evidence confirms Bun-in-Rust runs in production
- ·Deployed across millions of different devices
- ·Delivered via Claude Code, quietly, no fanfare
- ·Simon Willison: evidence proves it's genuinely live
- ·Echoes Jarred's framing: boring is good
- ·No announcement needed — it just works at scale
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Evidence · 2
Running strings on a local Claude Code binary and grepping for 'Bun v1' reveals the string 'Bun v1.4.0 (macOS arm64)', a version number newer than any publicly released Bun build.Simon Willison · Simon Willison's Weblog · conf 75%A second strings/grep command against the Claude Code binary extracts a list of 563 Rust source filenames, including files like src/runtime/bake/dev_server/mod.rs and src/bundler/bundle_v2.rs, embedded in the compiled binary.Simon Willison · Simon Willison's Weblog · conf 75%