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

Summary

Anthropic's Claude Fable 5 hits 88 percent accuracy on the hardest FrontierMath tier, a massive jump from Opus 4.5, which sat below 10 percent in early 2026. OpenAI's GPT-5.5 reaches about 75 percent on the same tier. The pace of improvement in AI math keeps accelerating.

SourceThe DecoderAuthor: Matthias Bastian
Claude Fable 5 outpaces GPT-5.5 by 13 points on FrontierMath's toughest problems
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Anthropic's Claude Fable 5 hits 88 percent accuracy on the hardest FrontierMath tier, a massive jump from Opus 4.5, which sat below 10 percent in early 2026. OpenAI's GPT-5.5 reaches about 75 percent on the same tier. The pace of improvement in AI math keeps accelerating.

The article Claude Fable 5 outpaces GPT-5.5 by 13 points on FrontierMath's toughest problems appeared first on The Decoder.

Key points and analysis

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Key points

  • Claude Fable 5 achieves 88% on FrontierMath's hardest problems
  • That's a leap from Opus 4.5's below 10% in early 2026
  • GPT-5.5 scores around 75% on the same tier
  • AI mathematical reasoning is improving rapidly

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