User A/B test suggests Opus 5.5 output quality shifted noticeably within a week

skelzer · reddit · 2026-09-30

Reddit user skelzer compared two videos generated in the same project with identical Mid reasoning settings, created on different dates, and argues one is decent while the other falls short — implying the model behind Opus changed noticeably within a week despite near-identical inputs. The post invites others to judge whether the model was quietly updated.

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