Anthropic says it is getting partial relief from the US-imposed restrictions on its latest AI models.
The company said in a statement that the government had greenlit limited access to Mythos 5 on Friday. Fable 5, meanwhile, remains on ice.
“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,” Anthropic said in its statement.
“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 partial reversal comes about two weeks after Anthropic said it had disabled access to Fable 5 and Mythos 5 in response to a US export-control order. The order barred access to the two models by foreign nationals, including foreign national employees inside Anthropic, which is based in San Francisco.
Anthropic said at the time that the order was tied to government concerns that model safeguards could be bypassed. The company disputed the severity of the issue and said that the government did not provide specific details “of its national security concern.”
The decision marked one of the most direct US government interventions yet in a frontier AI model rollout, raising questions about how the administration plans to regulate access to powerful models that pose potential national security concerns.
Anthropic’s biggest rival, OpenAI, said on Friday that the US government requested that it limit preview access for its latest series of models, called GPT-5.6, to a “small group of trusted partners.”
In a statement, OpenAI said such government-imposed limits should not become the norm.
“We don’t believe this kind of government access process should become the long-term default,” the company said. “It keeps the best tools from users, developers, enterprises, cyber defenders, and global partners who need them.”
