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Anthropic's Claude Fable 5 scores 161 on Epoch Capabilities Index, surpassing GPT-5.5 Pro
Anthropic's Claude Fable 5 scores 161 on the Epoch Capabilities Index, beating GPT-5.5 Pro with dominant results on FrontierMath and SWE-Bench Pro
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the-decoder.com
Claude Fable 5 outpaces GPT-5.5 by 13 points on FrontierMath's toughest problems
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…
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thenextweb.com
Fable 5 vs GPT 5.5: Anthropic's model dominated every benchmark, then the government pulled it
Anthropic's Fable 5 led every major AI benchmark over OpenAI's GPT 5.5 before a US export control directive forced it offline three days after launch.
