US allows partial release of Anthropic's Mythos AI model
June 27, 2026
The United States government has authorized Anthropic to release its powerful Claude Mythos 5, an artificial intelligence model, to some "trusted" American cybersecurity firms, the company announced on Friday.
"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," Anthropic said in a statement on Friday.
"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," the statement added.
The announcement comes two weeks after the Trump administration had blocked access to Mythos 5. Anthropic has had a thorny relationship with the Trump administration for months.
Why were Anthropic's AI models blocked by the Trump administration?
Anthropic abruptly rolled back its most advanced AI models, Mythos 5 and Fable 5, for all users after the government issued an order on June 12 restricting their release.
The Trump administration had cited concerns that powerful AI systems could be misused by military intelligence users in China, Russia or other countries to take an aggressive approach to oversight of releases of Anthropic's and rival OpenAI's frontier models.
The Trump administration was accused of government overreach over its strong control measures against Anthropic.
Concerns over who gets access to the powerful AI models
The Trump administration has not revealed how it will vet the organizations and which companies, and on what grounds, they will get access to Mythos.
OpenAI boss Sam Altman echoed concerns about the government's choosing of who gets access to top models in a post on X.
Extensive safety testing "is not a bad idea. I just don't like the idea of the government picking the customers," he wrote.
More than 100 companies and institutions will now have access to Mythos 5, including many Fortune 500 companies, a source familiar with the new directive told Reuters news agency on the condition of anonymity.
Edited by: Jenipher Camino Gonzalez