Citing national security concerns, an export control directive has led to a government mandate requiring Anthropic to block access to its Fable 5 and Mythos 5 models. Issued on Friday evening, this order specifically targets all foreign nationals, both inside and outside the United States, including Anthropic's own employees. To fully comply with the broad scope of this directive, the company has taken the drastic step of completely cutting off access to these models for all its customers.
Anthropic promptly issued a statement confirming its compliance with the government's order. However, the company also highlighted that authorities "did not provide specific details of its national security concern." Anthropic further asserted that any alleged evidence of potential "jailbreaks" – methods to circumvent AI safety controls – was communicated verbally. The company characterized these discovered vulnerabilities as minor and noted that similar findings were already present in other widely available models, such as GPT 5.5.
In its detailed statement, Anthropic outlined the extensive measures it had already implemented to safeguard Fable and Mythos. These included collaborative efforts with both the US and UK governments, as well as modifications to its data retention policy designed to better track any attempts at malicious use. The company emphasized its position, stating: "We have not even received a disclosure of a concerning non-universal potential jailbreak that led to a harmful result. The potential jailbreaks that have been disclosed to us are either entirely benign responses or are minor findings that provide no Mythos-specific uplift."
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