Two weeks after a ban pushed Anthropic to pull Mythos 5 and Fable 5, the Trump administration is allowing Mythos 5 to be redeployed to more than 100 specific U.S. agencies and companies—along with access for non-American employees at those organizations. The d
Two weeks after a ban triggered Anthropic to pull its cybersecurity-focused models from the market, the Trump administration has started walking back parts of the restrictions—quietly, and with specific carve-outs.
Anthropic’s Claude Mythos 5 is now being allowed for use by more than 100 named U.S. government agencies and companies. The change also extends access to non-American employees at those organizations. a detail that directly collides with what the original ban required—non-Americans were barred from accessing the models. including Anthropic’s own non-American employees.
Commerce Secretary Howard Lutnick laid out the shift in a letter sent to Anthropic’s chief compute officer Tom Brown on Friday. In the message—seen by Semafor—Lutnick wrote: “I have determined that appropriate safeguards are in place to permit certain trusted partners to access the Claude Mythos 5 Model.”.
The letter, however, leaves one major question hanging. The administration’s directive does not address the release of Fable 5.
That omission matters because Fable 5 has its own recent history with the ban. A version of Mythos 5 had been released widely a couple of days before the restrictions began. with claims that it offered more protections. Both Mythos 5 and Fable 5 were pulled after those guardrails were allegedly bypassed easily by security researchers.
Anthropic has acknowledged the tension inside its own rebuilding effort. On Friday, it posted on X that it has been working with the U.S. government since June 12 to restore access to both models. The company wrote: “Since June 12. we’ve been working closely with the US government to restore access to Claude Mythos 5 and Fable 5. Today. the government notified us that Mythos 5. our strongest cybersecurity model. can be redeployed to a set of US organizations that operate and defend critical infrastructure. We’re restoring access for these organizations quickly. and we’re continuing to work with the government to expand access to Mythos 5 and make Fable 5 available for general use again.”.
Behind the wording is a practical reality: trusted partners are getting back a key cybersecurity tool, even as the model’s broader availability remains locked up—and even as the administration’s own communication stays silent about what happens to Fable 5 next.
Anthropic did not immediately respond to a request for comment.
Anthropic Claude Mythos 5 Fable 5 Trump administration Commerce Secretary Howard Lutnick Tom Brown cybersecurity models AI regulation critical infrastructure US government agencies