Anthropic Suspends Fable 5 and Mythos 5 After US Government Issues Export Control Directive

TLDR: The US government issued an export control directive ordering Anthropic to suspend all Fable 5 and Mythos 5 access globally. Anthropic reviewed the jailbreak report and found the capabilities were already available in models like OpenAI’s GPT-5.5. The reported jailbreak involved asking Fable 5 to read a codebase and flag software flaws, with no [...]

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