Dev says Claude Opus 5.5 finds music theory bugs other models missed for weeks
doodlestein · x · 2026-09-23
Developer doodlestein shares first-hand impressions of Claude Opus 5.5, calling it breathtaking: it surfaced music theory errors in his skills library that other models missed for weeks, and shows unusual agency and resolve while grinding through tricky problems. Anecdotal but notable model-behavior observation, unverified by benchmarks.
Related event: Opus 5.5 Praised as Biggest Leap Since 4.6 for Finding Weeks-Old Bugs(3 posts)→
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