The U.S. government issued an emergency export control directive on Friday ordering Anthropic to immediately suspend access to its two most advanced AI models, Claude Fable 5 and Claude Mythos 5, for all foreign nationals, citing national security concerns over a potential jailbreak vulnerability. The directive forced Anthropic to disable the models for its entire customer base to ensure compliance. Anthropic disputed the severity, stating that the vulnerability is simple and replicable using other publicly available models like GPT-5.5. The company warned that this sets a dangerous precedent that could halt all new frontier AI model deployments if applied industry-wide. David Sacks, co-chair of the President's Council of Advisers on Science and Technology, claimed that a trusted partner discovered the jailbreak and that Anthropic CEO Dario Amodei refused to fix it, contradicting the company's safety branding. This follows previous tensions between Anthropic and the government over surveillance and autonomous weapons agreements.

Key facts

• US orders Anthropic to suspend Fable 5 and Mythos 5 over national security concerns.
• Anthropic complies but calls the vulnerability simple and replicable via GPT-5.5.
• Company warns precedent could halt all frontier AI model deployments.
• White House advisor Sacks says Anthropic CEO refused to fix the jailbreak.
• Tension follows earlier disputes over surveillance and autonomous weapons.
• Government seeks to restore access after fix, ball in Anthropic's court.

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