AIThe Decoderabout 8 hours ago
Claude Fable 5 beats GPT-5.5 by 13 points on FrontierMath
1 min read
Anthropic's Claude Fable 5 scores 88 percent on FrontierMath's hardest tier 4, outpacing OpenAI's GPT-5.5 by 13 points. GPT-5.5 reaches about 75 percent on the same tier. Fable 5's predecessor, Opus 4.5, scored below 10 percent on tier 4 in early 2026.
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