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OpenAI's GPT-6 Astra scores 97.6% on Epoch AI's FrontierMath Tier 4 (v2) math benchmark, versus 87.8% for Anthropic's Claude Fable 5.1 GPT-6 Astra: 97.6% on FrontierMath Tier 4 (v2), vs Claude Fable 5.1's 87.8%
Verified 2026-09-18
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