Sonnet 5.5 ranks #2 in AA Index, beats Fable 5.1 and GPT-6 Sol

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Alex Getman @alexgetmancom · 28 Sep 2026, 18:36 UTC · Updated 31 Oct 2026, 20:59 UTC

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🚨 Sonnet 5.5 ranks #2 on the Artificial Analysis Intelligence Index, ahead of Fable 5.1.

It also beats GPT-6 Sol by 8 points.

Screenshot of Artificial Analysis Intelligence Index bar chart showing Sonnet 5.5 (56) ranked second, ahead of Claude Fable 5.1 (53) and GPT-6 Sol (48), marked with a question mark.

Fable 5 Anthropic Claude

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