Frontier Models Miss Over Half of 105 Hidden Bugs in Coding Benchmark

A benchmark of seven frontier models across two codebases revealed significant limitations in AI debugging, with 63 out of 105 hidden bugs remaining undetected by any model. GPT-5.6 Sol performed best but still managed to fix only 31 bugs.

2026-07-27 ~ 2026-07-27 · 4 related posts

• GPT-5.6 Sol fixes 31 of 105 hidden bugs in a two-repo benchmark — PawelHuryn · 2026-07-27
• GPT-5.6 Sol fixes 18 planted regressions and 29 more in a 60-bug LMS benchmark — PawelHuryn · 2026-07-27
• Seven frontier models miss 44 hidden bugs even with 922 green tests — PawelHuryn · 2026-07-27
• Across 105 hidden bugs, 63 survived every frontier model — PawelHuryn · 2026-07-27