Anthropic bringing back Claude Fable 5, Mythos 5 globally after US removes restrictions

Anthropic's most advanced AI models are coming back for global users. After a two-week export ban over national security concerns, the US has lifted restrictions on Claude Fable 5 and Claude Mythos 5, allowing the company to restore access soon.

In Short

• US lifts export restrictions on Claude Fable 5 and Claude Mythos 5
• The ban was imposed citing national security concerns and potential AI misuse
• Anthropic to restore global access after agreeing to strengthen AI safety and security measures

Anthropic is bringing back global access to its most advanced artificial intelligence models, Claude Fable 5 and Claude Mythos 5, after the US government lifted export restrictions that had blocked their release outside the country last month. The company confirmed that it had received notice from the US Department of Commerce and would begin restoring access from July 1, ending a ban that lasted just over two weeks.

The restrictions on Anthropic's two most powerful Claude models, Claude Fable 5 and Claude Mythos 5, were first imposed on June 12 after the US government raised national security concerns over the frontier AI models. At the time, Anthropic was instructed to halt exports and transfers of Claude Fable 5 and Claude Mythos 5 to foreign users unless it obtained a licence. To comply with the order, the company suspended access for customers outside the US, including some of its own foreign national employees.

Now, the company has announced that the restrictions have been lifted. In a post on X, Anthropic said, "We've received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5."

"We'll begin restoring access tomorrow and will share an update soon. We're grateful to our users for their patience, and to everyone who worked with us on redeploying the models."

The decision to reverse the ban comes after weeks of discussions between Anthropic and the Commerce Department. According to US Commerce Secretary Howard Lutnick, officials worked closely with the company to review the capabilities and risks associated with Fable 5 before deciding to lift the restrictions.

"Over the past two weeks, we have worked closely with Anthropic to analyse and approve Fable 5 to ensure alignment across the US government and strengthen America's leadership in AI," Lutnick wrote on X.

Why were the models restricted?

Claude Fable 5 and Claude Mythos 5 are among Anthropic's most capable AI systems. Built on the company's Claude platform, which competes with OpenAI's ChatGPT and Google's Gemini, the models are designed to perform complex reasoning, write code and solve sophisticated tasks.

Claude Fable 5 is aimed at general users and developers, while Claude Mythos 5 is built for enterprise and cybersecurity use cases. Anthropic says Mythos can identify vulnerabilities in software and help security teams detect weaknesses more efficiently. However, US officials were concerned that the same capabilities could also be misused to discover and exploit security flaws if they fell into the wrong hands.

Another concern centred on reports of "jailbreak" that allegedly allowed users to bypass some of Fable 5's built-in safety protections. Anthropic argued that the workaround was limited in scope and that similar techniques existed for other publicly available AI models. The company also maintained that the government had not identified any real-world harm caused by the models.

But these concerns ultimately prompted the US government to impose the export restrictions and ask Anthropic to suspend overseas access to the models.

Following the ban, for over two weeks, Anthropic worked with the Trump administration to address those concerns. According to a letter viewed by US media, the company agreed to proactively detect and address security risks, work with the government on safety protocols and standards for current and future AI models, and report any malicious activity involving the technology.

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