AI-Generated Code Is Already Competing With Human Code — Daksh Gupta, Greptile
More than a quarter of the pull requests Greptile reviewed in April showed signs of being written largely or entirely by AI agents, up from under 1% a year earlier.
Daksh Gupta, co-founder of Greptile, analyzed more than a million pull requests a month from companies like NVIDIA, Coinbase and Scale to test a simple question: are fully vibe-coded PRs actually any good in enterprise codebases? He compares agent-written PRs (Codex, Claude Code, Devin, Cursor) with human-written ones on four measures: revert rates, revert rates by PR size, the severity of issues Greptile flags (P0/P1/P2), and how many review rounds it takes to get to a mergeable PR. On all four, agent code landed in the same range as human code, and humans were actually more likely to introduce P0 bugs. The differences show up in *how* each one fails: Claude is about 1.5x more likely than humans to introduce SQL injection, Devin is half as likely to cause auth bypasses, and N+1 queries are far more common from Cursor. Daksh also shares what this means for code review.
The text is the source's own description of its publication. The content belongs to AI Engineer.
