Dex describes a July 2025 experiment where his team let a model write code with zero human review; four months later production broke in a way even Opus 4.1 couldn't diagnose, forcing the whole system to be scrapped. ✦ AI generated
Dex Horthy · The Pragmatic Engineer · 2026-07-15 · original ↗
Dex experimented with having the model write the code and humans not reviewing anything in July 2025. Four months later, they shut things down and threw the whole system out. Production broke, and no matter how much the team prompted Opus 4.1, the model could not find the root cause.
Read full article ↗excerpt · fair-use quotation