SlopCodeBench update 10/2026 - Opus 5.5 update, Astra wins overall, xhigh considered harmful
Summary
SlopCodeBench updates for October 2026 report Opus 5.5, Astra, and SOL model performance across 36 problems with 196 checkpoints. Astra with XHigh leads strict passes at 32/196 (16.33%), while Opus 5.5 Medium achieves higher core performance but fewer strict passes; cost efficiency varies and higher effort does not consistently yield more strict passes. The report also highlights code quality observations, maintainability concerns, and a takeaway that progress is real but not as dramatic as some claims suggest.