It also scores 43 on the knowledge benchmark it leads, on a scale that runs from minus 100 to 100, and 55.5% on an exam built so models fail it.
“Claude Fable 5 is Anthropic's most capable public model and the new benchmark leader, topping the Artificial Analysis Intelligence Index and Humanity's Last Exam and setting the highest score to date on the AA-Omniscience knowledge and hallucination benchmark.”
Anthropic positioning and benchmark coverage (Claude Fable 5, August 2026)
Recorded 19 August 2026. Our ruling means: literally true, materially misleading.
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“AI is dramatically accelerating AI research at Anthropic right now, roughly doubling the pace of capabilities progress.”
TRUE, BUTLab Not FieldAjeya Cotra on Planned Obsolescence, reading METR's assessment and Anthropic's S-1 statement that it may imminently meet its own threshold
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