Opus 4.6 Reasoning Degradation Erupts: 3,700+ Combined Upvotes Across Subreddits, Multiple GitHub Issues Filed

r/ClaudeAI (3187↑, 455cmts) / r/LocalLLaMA (582↑, 227cmts)·high signal

A massive community backlash over perceived Opus 4.6 quality degradation has erupted across r/ClaudeAI (3,187↑, 455cmts — 'Something happened to Opus 4.6's reasoning effort') and r/LocalLLaMA (582↑, 227cmts — 'It's insane how lobotomized Opus 4.6 is right now. Even Gemma 4 31B UD IQ3 XXS beat it on the carwash test'). Multiple GitHub issues document patterns including speculation loops replacing systematic debugging, confident-but-wrong analysis, and production pipelines producing 'Sonnet 3.5-level output.' This is the highest-engagement model quality complaint observed across any provider in recent weeks.