The US Government Relaxes Restrictions on Anthropic’s Claude Mythos 5 AI Model
The US government has eased restrictions it placed on Anthropic’s most advanced AI model, Claude Mythos 5, allowing the company to provide access to more than 100 U.S. organizations, including major corporations and government agencies.
Background and Recent Developments
In a letter to Anthropic co-founder and chief compute officer Tom Brown, obtained by WIRED, US Commerce Secretary Howard Lutnick informed the AI lab of the decision to allow certain trusted partners to access Mythos. Lutnick stated that this was possible because he had “determined that appropriate security measures were in place.” Semafor first reported the existence of the letter.
“Anthropic has worked with the U.S. government to address the risks associated with the covered models. These efforts have resulted in significant progress,” Lutnick wrote.
Despite this progress, the government has not approved a wider rollout of the model and remains silent about Claude Fable 5, the consumer-focused version of Mythos, which Anthropic released with significant additional safeguards. Lutnick noted in his letter that the other requirements outlined in the original directive sent on June 12 remain in effect.
Anthropic’s Response and Future Plans
“We have received notification from the U.S. government that Mythos 5, our strongest cybersecurity model, may be transferred to a small group of cyber defenders and infrastructure providers,” Anthropic spokesman Eduardo Maia Silva stated to WIRED. “We are working to deploy approved providers and restore their access to Mythos 5 as quickly as possible. We are pleased with this progress and continue to work with the government to expand access to Mythos 5 and make Fable 5 available for general use again.”
Anthropic is still negotiating with the White House about restoring access to Fable 5 and is expected to resume this weekend, according to a person familiar with the matter. Both parties are confident that resolving this incident will help establish a lasting policy framework for future model releases, the person said.
Export Controls and Security Concerns
The partial reinstatement comes about two weeks after the White House sent an export control directive to Anthropic requiring the company to restrict access to Mythos and Fable 5 by foreign nationals, including people working and living in the United States. In response, Anthropic completely blocked access to the models. In his latest letter, Lutnick wrote that organizations approved to use Mythos could now allow their foreign employees to access the model, and Anthropic could do the same for its own foreign employees.
The Trump administration became increasingly concerned about Anthropic’s launch of Mythos after learning that the company was providing access to a South Korean telecommunications company, which it believed had ties to China, WIRED previously reported. Amazon and the National Security Agency also separately raised concerns with the White House that Fable 5 could be jailbroken, and the confluence of events convinced officials they needed to take action.
Ongoing Negotiations and Industry Impact
In recent weeks, Anthropic sent senior members of its cybersecurity and AI security teams to Washington, DC, to meet with Trump administration officials. Along with Brown, Anthropic’s public policy chief Sarah Heck led the company’s discussions with the U.S. Department of Commerce.
The recommissioning of Mythos 5 represents a promising step forward for Anthropic and the White House, but the saga has raised broader questions about the overall direction of U.S. AI policy, particularly about the extent to which the Trump administration will seek to control future model releases. On Friday, OpenAI announced that it was delaying the release of its upcoming GPT 5.6 models in response to a request from the Trump administration.
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