Anthropic announced that, following a notification from the US Department of Commerce, restrictions on its most powerful AI models, Claude Fable 5 and Mythos 5, have been lifted.
In a statement, the company said, "We are grateful to our users for their patience and thank everyone who worked with us to redeploy the models."
A letter from US Commerce Secretary Howard Lutnick to Anthropic that circulated online stated that the company no longer needs an export license because it has agreed to "proactively identify and address" security risks related to the models, work with the government on standards for future models, and report "malicious activities" to the government.
Last month, Anthropic abruptly shut down Claude Fable 5 and Mythos 5 after the Trump administration instructed the company to restrict access to the models by all foreign nationals, including foreign employees.
At the time, the company said that the government did not provide a specific reason beyond national security concerns, but it believed officials were worried about security vulnerabilities in Fable 5.
Last Friday, the San Francisco-based company announced it had received approval to provide the models to US organizations that "operate and defend critical infrastructure."
The restrictions were the latest example of the strained relationship between the Trump administration and Anthropic. In March, Anthropic sued the US Department of Defense after the Pentagon labeled the company a "supply chain risk."
Francesco Bailo, deputy director of the University of Sydney's Center for AI, Trust and Governance, told Al Jazeera that the lifting of restrictions was expected in technology circles. Bailo said reports that researchers were able to "jailbreak" Fable 5 were greatly exaggerated, adding, "The US government probably realized it overreacted and that this decision would set a dangerous, messy precedent for regulations and would get a strong backlash from an industry that has invested heavily in maintaining close communication with the Trump administration." Bailo added, "If Fable and Mythos were blocked on these grounds, it was clear that rival models would also have to be blocked."
Tanishq Abraham, a former research director at Stability AI who now runs the medical AI company Sophont, described the Trump administration's latest move as a "big development" and said it raises important questions about industry regulation. Abraham told Al Jazeera, "From the outside, it seems like the troubled relationship between Anthropic and the US government is improving, likely thanks to Tom Brown's efforts." Abraham said, "Now the big question is: What kind of precedent does this set for the industry? Does the US government need to approve every frontier model release? We already started seeing that with GPT-5.6. There are many unanswered questions about how frontier labs should interact with the US government."