{"slug": "claude-fable-5-outpaces-gpt-5-5-by-13-points-on-frontiermath-s-toughest-problems", "title": "Claude Fable 5 outpaces GPT-5.5 by 13 points on FrontierMath's toughest problems", "summary": "Anthropic's Claude Fable 5 achieved 88 percent accuracy on the hardest FrontierMath tier, surpassing OpenAI's GPT-5.5 by 13 points. The result marks a dramatic improvement from Anthropic's previous Opus 4.5 model, which scored below 10 percent in early 2026.", "body_md": "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.\n\nThe article [Claude Fable 5 outpaces GPT-5.5 by 13 points on FrontierMath's toughest problems](https://the-decoder.com/claude-fable-5-outpaces-gpt-5-5-by-13-points-on-frontiermaths-toughest-problems/) appeared first on [The Decoder](https://the-decoder.com).", "url": "https://wpnews.pro/news/claude-fable-5-outpaces-gpt-5-5-by-13-points-on-frontiermath-s-toughest-problems", "canonical_source": "https://the-decoder.com/claude-fable-5-outpaces-gpt-5-5-by-13-points-on-frontiermaths-toughest-problems/", "published_at": "2026-06-13 10:16:26+00:00", "updated_at": "2026-06-13 10:24:19.436826+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "ai-research", "ai-products"], "entities": ["Anthropic", "Claude Fable 5", "OpenAI", "GPT-5.5", "Opus 4.5", "FrontierMath"], "alternates": {"html": "https://wpnews.pro/news/claude-fable-5-outpaces-gpt-5-5-by-13-points-on-frontiermath-s-toughest-problems", "markdown": "https://wpnews.pro/news/claude-fable-5-outpaces-gpt-5-5-by-13-points-on-frontiermath-s-toughest-problems.md", "text": "https://wpnews.pro/news/claude-fable-5-outpaces-gpt-5-5-by-13-points-on-frontiermath-s-toughest-problems.txt", "jsonld": "https://wpnews.pro/news/claude-fable-5-outpaces-gpt-5-5-by-13-points-on-frontiermath-s-toughest-problems.jsonld"}}