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On June 9, Anthropic released Claude Fable 5 to the public

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Fable 5, Anthropic’s “Mythos-class” model with safeguards, was available for a few days before the US government ordered access restrictions due to national security concerns. Source.

The model is significantly more capable than previous releases; it is the highest-scoring model on the benchmark Humanity’s Last Exam, achieving 53.3% compared with Claude Opus 4.8’s score of 45.7%.

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Summary

Welcome to the AI Safety Newsletter by the Center for AI Safety. In this edition, they look at Anthropic’s release of its latest model, Fable 5, and the US government’s subsequent order to restrict it. Listen to the AI Safety Newsletter for free on Spotify or Apple Podcasts. On June 9, Anthropic released Claude Fable 5 to the public. The US government quickly ordered access restrictions.

#Financial Times #Anthropic #DeepSeek #Claude #EU AI Act #SpaceX #Mythos #China #xAI