AnalysisAI ModelsSeptember 26, 2026

Claude Opus 5.5 tops writing benchmark with 2631 Elo

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Claude Opus 5.5 scored 2631 Elo on a community writing benchmark, 307 points ahead of second-place Fable at 2324 — the largest single jump recorded since the benchmark started in June 2026. It is also the first model to clear 91 out of 100 on the benchmark's secondary metric.

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