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Is Opus 5.5 nerfed? Thinking patterns changed on November 3

Katherine Langford
Editor-in-Chief · Monday, November 9, 2026 at 7:04 AM · 1 min read
Is Opus 5.5 nerfed? Thinking patterns changed on November 3 — Paris Technology news

Shane Melaugh @shanemelaugh 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. 10:15 PM · Nov 7, 2026 · 494K Views 291 358 2.7K 880

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