GPT-6 Astra, Claude Fable 5.1 Top Artificial Analysis Index

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Alex Getman @alexgetmancom · 7 Sep 2026, 18:32 UTC · Updated 31 Oct 2026, 20:59 UTC

Tests & comparisons

🚨 GPT-6 Astra is officially #1 on the updated Artificial Analysis Intelligence Index, sharing the top spot with Claude Fable 5.1.

Bar chart of Artificial Analysis Intelligence Index v4.3 showing GPT-6 Astra and Claude Fable 5.1 (with fallback) tied at the top with a score of 53, ahead of other models like Claude Opus 5 and Muse Spark 1.3.

Claude Fable 5 Anthropic OpenAI Claude GPT

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Analysis

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