Anthropic postmortem: when AI writes code too fast, patching test infra stops paying off

CI 的第二层红利：重写变便宜之后，补丁不再回本

Anthropic's test-impact-analysis service saw 25× load growth in six months. Three patches bought 70 days, 29 days, then less than a day of stability. One engineer rewrote it in three weeks—a task the author estimates would have taken a quarter a year ago. The rewrite cost dropped while the hidden cost of patching rose, shifting the break-even point earlier. The post does not disclose the new system's exact running cost, defect rates, or production incident data.

Why it matters: First-person postmortem from an Anthropic engineer with concrete numbers and a decay curve across three patches—not generic AI productivity fluff. Hits all three HKR axes, but as an engineering practice piece rather than a product launch or model breakthrough, it lands in the ...