Claude Code v2.1.181 起改用 Rust 重写的 Bun，启动速度提升 10%
决策简报
Brief- 发生了什么
- Simon Willison’s Weblog Subscribe Sponsored by: Atlassian — Give your agents a plan. Not a prompt. New Jira capabilities unlock full-context for AI-native software development. Assign tasks to Claude, Cursor, or GitHub Copilot, now directly from Jira. Learn more 19th July 2026 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". Posted 19th July 2026 at 3:54 am Recent articles Kimi K3, and what we can still learn from the pelican benchmark - 16th July 2026 The new GPT-5.6 family: Luna, Terra, Sol - 9th July 2026 sqlite-utils 4.0, now with database schema migrations - 7th July 2026 This is a note by Simon Willison, posted on 19th July 2026 . rust 112 anthropic 311 claude-code 122 bun 7 jarred-sumner 3 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
- 为什么重要
- Claude Code 相关结果会影响评测基准、技术路线和后续产品判断。
- 影响谁
- Claude Code · Claude · GPT · Cursor
- 建议动作
- Upgrade or review the changed version
- 地区可用性
- No region-specific availability verified.
关键事实
- Claude Code 从 v2.1.181 开始使用 Rust 移植版 Bun，Linux 启动快 10%。 [src-simonw-blog]
- 改用 Rust 重写的 Bun 意味着底层 JS 运行时更稳定、启动更快，Claude Code 用户几乎无感但体验提升。 [src-simonw-blog]
Generated from event evidence.
根据 Bun 作者 Jarred Sumner 的声明，Claude Code v2.1.181（2026 年 6 月 17 日发布）及后续版本已切换至用 Rust 重写的 Bun。经确认，macOS arm64 上运行的 Bun 版本为 v1.4.0（早于公开的 v1.3.14），二进制文件中还发现了 563 个 .rs 源文件路径，证实了 Rust 实现已在生产环境运行。官方称 Linux 启动速度提升约 10%，其他平台变化不大。对于使用 Claude Code 的开发者，这次升级完全透明，无需任何操作即可获得更快的启动体验和潜在的稳定性提升。
摘要依据：已读全文详摘依据上方标注的来源范围整理，内容以原文为准。
来源
- Simon Willison：Blog
Hands-on notes on LLM tools, local models, and practical AI engineering.
- Simon Willison：Blog
留言
登入后即可留言，和其他 builder 交换实测心得。
还没有留言，抢头香。