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ModelsThe Decoder·June 13, 2026

Claude Fable 5 outpaces GPT-5.5 by 13 points on FrontierMath's toughest problems

Claude Fable 5 just outperformed GPT-5.5 by 13 points on FrontierMath's toughest problems. This shows Claude's growing strength in tackling complex mathematical challenges, which could enhance its utility in educational and professional settings.

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