YC's Garry Tan fixes 28 bugs in one AI-assisted 'fix wave' PR with Capy

garrytan · x · 2026-09-29

Garry Tan, president of Y Combinator, shared that he fixed 28 bugs in his project gbrain in a single 'fix wave' pull request working with Capy, an AI coding tool, calling the experience extremely satisfying. It's a firsthand data point from a prominent operator on how AI coding assistants are changing day-to-day engineering throughput.

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