Users Claim Opus 5.5 Reasoning Shifted Abruptly on November 3, Suspect Nerfing
By Shane Melaugh (@shanemelaugh)Original title: Is Opus 5.5 nerfed? Thinking patterns changed on November 3
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A user claims that analyzing 1,400 Claude Code sessions with Gemini 4 Argon revealed a sharp shift in how Opus 5.5 reasons starting November 3, despite no change to the model name, suggesting a possible nerf. The claim rests on personal observation without verifiable benchmarks or official confirmation.
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Shane Melaugh (@shanemelaugh) · 2026-11-07 22
is Opus 5.5 nerfed?
I just had Gemini 4 Argon analyze 1,400 Claude Code sessions and it found that on November 3, something definitely happened.
the model name didn't change, but the way it does reasoning took a sharp turn.
