- Sources: Lockwood post, original Bun post, bun-v1.3.14 release, HN 49067854
- Summary: Tom Lockwood published a post dated 2026-07-27 examining the Rewriting Bun in Rust claim that Jarred Sumner posted on 2026-07-08. The original post states the rewrite ran across 11 days between 3 and 14 May 2026, cost $165,000 in Anthropic API calls, and was merged to main. Lockwood reports that no release tag has shipped since that merge. The GitHub releases API read at this run confirms bun-v1.3.14, published 2026-05-13, as the latest release, about eleven weeks before this run. Lockwood reports open pull requests from the robobun account moving from 1,277 on 2026-07-09 to 2,475 on 2026-07-27, merges appearing to take 40 to 90 minutes of pipeline time, and some pull requests authored by Anthropic employees. His figure of roughly $800,000 in total spend is his own extrapolation from an assumed $10,000 per day, not a reported number, and his commit attribution rests on an assumption that Sumner's commits during the rewrite used Claude. He discloses that he is looking for work.
- Why it matters: The release tag and the pull request counts are checkable, and they are the concrete counterweight to a widely cited claim that an agent completed a runtime rewrite for a fixed and modest sum.
- Follow-up: Watch for a Bun release tag containing the Rust rewrite and for a maintainer statement on the open pull request backlog.
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