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Anthropic has suspended access to its advanced Fable 5 and Mythos 5 AI models after a US government export control directive cited national security concerns linked to a potential jailbreak method. The company disagreed with the decision, arguing the identified vulnerabilities were minor and already known, while maintaining that Fable's safeguards remain among the industry's strongest.

New Delhi: AI company Anthropic has said the US government issued an export control directive, ordering the company to suspend all access to its advanced "Fable 5 and Mythos 5" models for any foreign national, including its employees, inside or outside the United States.

Model access suspended
The company is abruptly disabling those models for all customers to comply with the order, Anthropic said in a blog post. Anthropic disagreed with the government's conclusion that the "finding of a narrow potential jailbreak should be cause for recalling a commercial model" deployed to millions of users.

The company feels that such a standard applied across the industry, would essentially halt all new model deployments for all frontier model providers.

Government concern over jailbreak
The US government did not provide specific details of the national security concern, Anthropic said, adding that the government believes it has become aware of a method of bypassing, or "jailbreaking," Fable 5. "We reviewed a demonstration of this specific technique being used to identify a small number of previously known, minor vulnerabilities," the statement said. "These vulnerabilities all appear relatively simple, and we have found that other publicly-available models are able to discover them as well without requiring a bypass," it added.