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Anthropic has disabled its top tier Claude Fable 5 and Mythos 5 after a U.S. export-control order limiting foreign access over an alleged “jailbreak,” calling the action disproportionate.
Anthropic said late Friday it had abruptly disabled its most advanced AI models, Claude Fable 5 and Mythos 5, after receiving a U.S. government export control directive that bars access to the systems by foreign nationals. The company described the move as necessary to “ensure compliance” while it seeks clarity.
The Commerce Department’s order reportedly stems from concerns that a method exists to bypass safeguards, a so-called “jailbreak” which could allow the models to identify software vulnerabilities, a capability regulators fear could be exploited. Anthropic said the government provided only “verbal evidence of a potential narrow, non universal jailbreak.”
Anthropic pushed back, saying the measure was unprecedented and disproportionate. “We disagree that the finding of a narrow potential jailbreak should be cause for recalling a commercial model deployed to hundreds of millions of people,” the company said, arguing the action could stifle new model deployments across the industry.
The order intensifies a growing rift between Anthropic and U.S. authorities that began earlier this year after the company refused military requests to use its models for domestic surveillance and autonomous weapons. The administration responded by adding Anthropic to a supply chain blacklist slated to take effect later this year.
Officials urged caution. The Pentagon’s chief information officer, Kirsten Davies, wrote on X that national security must come first: “Some things are simply more important than revenue cycles, clickbait and pre-IPO valuation. America First. Always,” she said, reflecting the security first posture behind the directive.
Anthropic’s announcement also complicates its ambitions; the company confidentially filed for a U.S. IPO last month and had just rolled out its “Mythos class” models, which it says include guardrails barring risky applications like cybersecurity. Security experts warn, however, that powerful generative models could speed sophisticated cyberattacks if misused, especially against banking and legacy infrastructure.
Amazon Web Services confirmed Anthropic asked it to revoke access to the models across regions, and a U.S. official said the Commerce Department had issued the export control directive. Anthropic described the situation as a “misunderstanding” and said it is working to restore access as soon as possible.
Industry observers say the episode highlights the tension between innovation, commercial rollout, and national security and signals a new phase of export controls that target AI models themselves, not just chips and hardware.
