Expired50% confidenceFactExact time
Google's internal research shows that code review quality drops sharply beyond 400 lines of code.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 9/30/2026(expired)
Sources
AI Code Output Up 10x — How Do You Keep Code Review from Collapsing?
bilibili枫叶边城6/15/2026
Related Claims
VerifiedWhen a single code review exceeds 400 lines of code, the reviewer's defect detection rate drops sharply.75% similarVerifiedGoogle's engineering practice research indicates that code review can detect approximately 60% of defects, far exceeding the approximately 30% detection rate of unit testing.69% similarUnverifiedCodeGraph tests show a reduction in the number of tool calls of approximately 58%.65% similarUnverifiedAn empirical study by Microsoft Research based on data from millions of code reviews shows that when a changeset exceeds 400 lines, reviewer comment density drops significantly and defect escape rates rise noticeably.64% similarUnverifiedUsing a prompt that simply says 'write less code' can reduce code volume by 33%, but the security metric drops to 95%.63% similar
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