GoKawiilLate last week, Anthropic took its new Claude Fable 5 and Mythos 5 AI models offline following a United States government export-control directive barring “any foreign national” from using the services. The company has been in talks with the White House since Friday but has yet to secure an agreement that would allow it to reinstate the offerings.
Since Mythos debuted in April, Anthropic has claimed—and warned—that the model has advanced capabilities for not only finding software vulnerabilities to help defenders patch them, but also figuring out ways to exploit them that could be used by bad actors. Anthropic itself noted this double-edged sword in its launch of Mythos 5 and Claude Fable 5. “A great deal of advanced usage of AI models is dual use: the same queries that are beneficial in the hands of cybersecurity professionals and biology researchers could be dangerous if available to malicious actors,” the company wrote in a blog post last week.
With this in mind, the company initially released a version called Mythos Preview to a select consortium as part of a working group known as Project Glasswing. Mythos 5 was also privately released to this group last week, while Claude Fable 5, which is a Mythos-grade model, was released to the general public with specific blocks on its ability to give responses to questions about biology and cybersecurity.
Then, at the end of last week, the Trump administration moved to restrict both models because it believes that Fable 5’s guardrails can be disabled to allow full access to the Mythos 5 capabilities, allegedly making it a national security risk.
Experts say, though, that this institutional clash is simply delaying or masking a hard truth: Anthropic may be the tip of the spear in this moment, but AI capabilities in general and models from multiple companies and open-weight developers will almost certainly have similar capabilities to Mythos 5 in the near future—if they don’t already.