Anthropic runs large-scale code migrations with Claude Code

vinhnx 31 points 31 comments July 19, 2026
claude.com · View on Hacker News

Discussion Highlights (3 comments)

SpicyLemonZest

> Jarred Sumner, co-founder of Bun and Member of Technical Staff at Anthropic, used Claude Code to migrate Bun from Zig to Rust. A million lines of code were produced in less than two weeks, with 100% of Bun's existing test suite passing in CI before merge. Nineteen regressions surfaced after merge and have all been fixed. I couldn't come up with a clearer example of how this kind of stuff fails to apply to my work. If I shipped nineteen regressions in 2 weeks, my company would be desperately apologizing to our customers, not writing a blog post about what a great job I did.

watwut

So, the whole brouhaha was so that Anthropic can write this blog post?

londons_explore

So I can expect an entirely-rust Linux kernel to be available next week then?

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