The U.S. government ordered Anthropic to shut off Claude Fable 5 and Claude Mythos 5 worldwide, citing national security. Anthropic complied but disagreed with the decision. Mythos found flaws in every major OS and browser tested. Fable 5 was the most capable public AI model by Vals AI benchmarks.
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Summary by ByteBrief
Claude Fable 5 banned, GPT 5.5 not banned