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FeaturedAIProducts#Anthropic#Bun#Claude Code#Rust#startup performance

Claude Code Now Ships with the Rust-Ported Bun

Simon Willison 博客（Atom）T2
11:5407/19, 11:54 AMCommunityRead the original ↗Export MD ↓

Score

75
Information gain8 ×0.3

首次公开揭示 Claude Code 底层 Bun 切换为 Rust 重写的具体证据，此前无类似细节披露

Content quality9 ×0.2

方法清晰（strings 命令）、证据链完整（版本号+文件列表），逻辑严谨

Practical value7 ×0.2

对 AI 工具开发者如何安全迁移底层运行时有参考意义，但普通用户影响较小

Timeliness9 ×0.15

文章写于 2026 年 7 月 19 日，对应 v2.1.181（6 月 17 日发布），时效性高

Source reliability9 ×0.15

Simon Willison 是知名技术博主，验证方法透明可信

Base 83 × T2 Source weight ×0.9 = 75

Curation line 70Selected

Why selected

High information gain; first empirical evidence of Claude Code's Bun migration, directly valuable for AI toolchain performance optimizers.

AI commentary

「This article caught my eye because it goes beyond features to uncover a core technology switch in Claude Code. For developers focused on AI tool performance optimization, it offers a rare inside look—the fact that a Rust rewrite could be deployed without user disruption shows Anthropic's solid engineering in compatibility and performance. If you're considering a Rust port of your own runtime, study Willison's forensic approach.」

Quick overview

As of Claude Code v2.1.181 (released June 17th), the tool ships with the Rust port of Bun (v1.4.0, not yet publicly released). Author Simon Willison discovered evidence by scanning the binary with strings, finding both the Bun version number and 563 .rs source file paths. Linux startup improved by ~10%, with negligible impact on other platforms. Bun creator Jarred Sumner commented, 'Boring is good,' highlighting a seamless migration.

  • Claude Code v2.1.181+ uses the Rust port of Bun
  • Evidence: strings command shows Bun v1.4.0 (unreleased) and 563 Rust file paths
  • Linux startup ~10% faster; other platforms unchanged
  • Bun creator calls the boring migration a positive sign

Full text

Showing the source text; the full translation is being generated.

In Rewriting Bun in Rust Jarred Sumner made the following claim:

Claude Code v2.1.181 (released June 17th) and later use the Rust port of Bun. Startup got 10% faster on Linux but otherwise, barely anyone noticed. Boring is good.

I decided to have a poke at my own Claude Code installation to see if I could find evidence that it was using Bun written in Rust.

I found these two commands convincing:

strings ~/.local/bin/claude | grep -m1 'Bun v1'

For me this outputs Bun v1.4.0 (macOS arm64). The most recent release of Bun on GitHub is currently v1.3.14 from May 12th, so that v1.4.0 version number in Claude supports them shipping a preview of a not-yet-released Bun version.

strings ~/.local/bin/claude | grep -Eo 'src/[[:alnum:]_./-]+\.rs'

This outputs a list of 563 filenames, starting with these:

src/runtime/bake/dev_server/mod.rs
src/runtime/bake/production.rs
src/bundler/bundle_v2.rs

It looks like Bun in Rust is indeed being run in production across millions of different devices. Like Jarred said, "Boring is good".

Tags: bun, rust, anthropic, claude-code, jarred-sumner

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