GPT-6 Astra leads every comparable benchmark against Claude Fable 5.1, Claude Fable 5, and Claude Opus 5. Clear wins (large gaps) ARC-AGI-3: Astra 98.6% vs Opus 5 30.2% (high). No scores for the Fable models. FrontierMath Tier 4 (v2): Astra 97.6% vs Fable 5.1 / Fable 5 87.8% and Opus 5 73.2%. AutomationBench: Astra 41.4% ...

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Link :
https://www.nextbigfuture.com/2026/09/openai-gpt-6-astra-limited-release-that-beats-anthropic-fable-5-1-on-benchmarks.html