The United States has lifted export restrictions on Anthropic's most advanced AI models, the company said late on Tuesday, after Washington suspended access over national security concerns about three weeks ago.
"We've received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5," Anthropic posted on X.
"Claude Fable 5 will be available again globally tomorrow," the company said. After a series of productive conversations with the US government, we're redeploying the model with a new set of classifiers to target and block more cybersecurity tasks. In the near term, some routine tasks like coding and debugging will fall back to Opus 4.8. We’ll continue to refine these classifiers over the coming weeks to reduce false positives and better distinguish genuine misuse from legitimate requests.
We’ve also begun drafting a consensus framework—with Amazon, Microsoft, Google, and other Glasswing partners—for assessing the severity of AI jailbreaks and how AI developers should respond to them. We invite other industry partners and model providers to join us in this effort.
Finally, we’re scaling up our collaboration with the US government on model testing and safeguards. This will include pre-release access to models and safeguards for evaluation, information sharing on jailbreaks and misuse, and dedicated resources for joint research.
Thank you to our users for your patience, and to our partners across the government, industry, and the research community who worked alongside us to make Fable 5 available again.
Anthropic to cooperate with US government on AI protocol
The US government had ordered Anthropic on June 12 to suspend access to the advanced models for foreign nationals, including Anthropic employees after identifying potential vulnerabilities that could allow misuse of the technology.
Last week, authorities allowed a small group of American cybersecurity firms access to Mythos 5.
In a letter seen by Reuters, Commerce Secretary Howard Lutnick said the restrictions were lifted after Anthropic agreed to:
- proactively detect and address security risks;
- cooperate with the US government on protocols for Mythos, Fable and future models and;
- report any malicious activity to the US government.
Lutnick added the department could reimpose restrictions if circumstances change or the company fails to meet its commitments.
US restrictions on advanced AI models
Earlier this month, US President Donald Trump signed an executive order establishing a voluntary framework for AI developers to offer "covered frontier models" to the US government for up to 30 days before releasing them to trusted partners.
The Trump administration's tough approach cites concerns that the advanced AI models could be misused by military or intelligence agencies in China, Russia and other countries.
On Tuesday, CIA Director John Ratcliffe compared the capabilities of the most advanced artificial intelligence models to nuclear weapons.
Anthropic AI shutdown — Security fears or power play?
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Some European lawmakers, meanwhile, described Washington's ability to shut off access as a "kill switch" that reinforced the need for the European Union to secure its own AI sovereignty.
Artificial Intelligence giant OpenAI has also limited the rollout of its latest GPT-5.6 model to vetted partners at the US government's request, while delaying a full public launch.
"This isn't quite the process that we think is optimal," OpenAI CEO Sam Altman posted on X on Friday.
Edited by: Zac Crellin
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