AnalysisAI ModelsSeptember 5, 2026

Claude Fable 5.1 tops GPT-6 Astra on AA Intelligence Index at 2.4x cost

Claude Fable 5.1 (max with fb) scores about two points above GPT-6 Astra (max) on Artificial Analysis's Intelligence Index, but costs roughly 2.4x as much per benchmark task. The comparison is filtered to top-tier models: Fable, Astra, Sol, and Opus.

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