Anthropic cuts off access to Fable 5 and Mythos 5 based on government order

On Friday evening, the government ordered Anthropic to block access to it Myth 5 and Mythos 5 to all foreign countries, both inside and outside the United States, due to national security concerns. This included Anthropic employees. To meet these demands, the company has completely cut off access to forms for all customers.

In a statementAnthropic said that although it complied with the order, the government “did not provide specific details regarding its national security concerns.” Instead, it claims that any evidence of possible jailbreaking was provided verbally, and that the vulnerabilities discovered were minor and available via other models, including GPT 5.5.

In its statement, the company explains the steps it has taken to protect Fable and the Mythos, including working with the US and UK governments and changing its system. Data retention policy To help track attempts to use it for malicious purposes. He goes on to say that:

We haven’t even received detection of a potential non-global jailbreak that resulted in a malicious result. The potential jailbreaks disclosed to us are either completely benign responses or are minor hits that provide no Mythos-specific improvement.