SLOPCODEBENCH

The October SlopCodeBench run found xhigh reasoning effort costs 2x to 4x more than medium without reliably passing more checkpoints. What the numbers say and what to change.

Opus 5 on SlopCodeBench hit a 24% strict pass rate, beating Opus 4.8 and Sonnet 5, yet code quality still degraded. What it shows about coding agents over time.