FEDS PULL THE PLUG ON ANTHROPIC’S TWO BEST MODELS: NATIONAL SECURITY JAILBREAK ALARM The United States government issued an export control directive ordering Anthropic to shut off access to Fable 5 and Mythos 5, its two most powerful AI models, for all foreign nationals worldwide. The order arrived on a Friday evening and Anthropic complied within hours. Paying customers outside the United States woke up to find they could no longer access the models they were depending on. The trigger was alarming. According to Anthropic, the Trump administration believed someone had discovered a method to jailbreak Fable 5, a way to strip the model of its safety guardrails and get it to produce outputs it was never supposed to generate. The government did not share specifics about what that output could enable, but the urgency of the order suggests the concerns went well beyond ordinary misuse. The situation escalated further when SK Telecom, South Korea’s largest carrier and a $100 million Anthropic investor, was identified as a potential security risk given its access to Mythos 5. Anthropic is pushing back on the directive, arguing that the standard applied here would freeze all frontier AI development. The company disputes the approach even as it complies. The precedent being set is enormous. Governments can now effectively pull AI models from the market on national security grounds with almost no public justification. Keywords: Anthropic export ban, Fable 5 Mythos 5, AI national security, AI jailbreak government