Anthropic’s Mythos 5 model has resumed operations for a select group of organizations, following a two-week negotiation process with the Trump administration. This progress was highlighted in a letter dated June 26th from Commerce Secretary Howard Lutnick to Anthropic co-founder Tom Brown.
The letter indicated that there had been a “revision to the license requirements,” based on Anthropic having worked with the U.S. government to address risks associated with both Mythos 5 and Fable 5. According to an Anthropic spokesperson, Danielle Ghiglieri, the company received notice from the US government that Mythos 5, described as their strongest cybersecurity model, could be redeployed to a small group of cyber defenders and infrastructure providers.
Lutnick stated in his letter: “In light of this progress … I have determined that appropriate safeguards are in place to permit certain trusted partners to access the Claude Mythos 5 Model.” Furthermore, Anthropic spokesperson Danielle Ghiglieri noted that the company was working to provision access for an approved set of providers and continue efforts to make Fable 5 available for general use again.
The government did not lift the export control directive issued two weeks prior. This ban previously restricted any foreign national from accessing either model, including Anthropic’s own employees. Instead, the exception was made specifically for Mythos 5, allowing access to a select group of organizations, similar to how OpenAI’s GPT-5.6 received an announcement.
Under this specific exception, Anthropic employees who are not US nationals and members of the approved organizations who are not US nationals were all greenlit to access Mythos 5, according to the letter. The administration has now permitted access to Mythos 5 for over 100 specific U.S. government agencies and companies. This expanded list reportedly includes non-American employees working at those organizations. The directive also permits Anthropic’s own non-American employees who were previously restricted by the original ban.
Anthropic stated that it was closely working with the U.S. government since June 12 to restore access to both Claude Mythos 5 and Fable 5, confirming that on the day of the announcement, the government notified them that Mythos 5 could be redeployed to organizations involved in operating and defending critical infrastructure.
Anthropic now faces a restricted deployment model similar to OpenAI’s. Both labs hope for general availability soon—for both enterprise deals and public access (like Fable 5)—but final approval rests with the Trump administration.
OpenAI, meanwhile, stated they do not believe this government access process should be the long-term default. They emphasized that while taking a short-term step, they are working to develop the cyber Executive Order framework and repeatable processes for future model releases.