Anthropic announces the return of Claude Fable 5 and Mythos 5, the United States has lifted the ban

Update on July 1, 2026:

Anthropic clarifies in a second post on X that “Claude Fable 5 will once again be available worldwide
” for all users. There is therefore no longer any restriction on this model.It will now have a “new set of classifiers designed to target and block more cybersecurity-related tasks.” These changes are intended to prevent any malicious use.

“We will continue refining these classifiers over the coming weeks to reduce false positives and better distinguish genuinely malicious uses from legitimate requests,” explains Anthropic.

However, Mythos 5 remains reserved for a select group of carefully vetted U.S. partners.

Claude Fable 5 will be available again globally tomorrow.

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…

— Anthropic (@AnthropicAI) July 1, 2026

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At the beginning of last month, Anthropic unveiled two new superpowered AIs, Claude Fable 5 and Claude Mythos 5, a restricted version of Mythos. It soon became apparent that the self-censorship mechanisms built into Anthropic were unable to prevent all malicious uses. Following an alert issued by Amazon researchers, the U.S. government took a keen interest in the new versions of Claude.

Washington has begun to fear that Fable 5 and Mythos 5 are being exploited by cybercriminals from Russia, China, or another foreign power to identify security vulnerabilities. In response, the Trump administration demanded that the start-up disable Claude Fable 5 and Mythos 5 for all foreign nationals, “inside or outside the United States.” Unable to comply with this requirement, Anthropic took the drastic step of cutting off access to the two models worldwide. All Anthropic subscribers therefore found themselves without access to the two new AI systems. Unsurprisingly, disabling the models caused an uproar around the world. Cybersecurity researchers and European political leaders stepped forward to call for Washington to ease its restrictions.

Also read: Anthropic vs Trump, China, Amazon warning… The story behind the suspension of Claude Fable 5 and Mythos 5

The new Claude models return on July 2, 2026

Nearly 20 days after the injunction, the Trump administration backed down. As revealed by Anthropic in a post on its X account, “the Department of Commerce lifted export controls on Claude Fable 5 and Mythos 5.” The company said it would begin restoring access to the AIs the following day, Wednesday, July 1, 2026. The latest iterations of Claude are expected to reappear in the interface over the course of the day.

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…

— Anthropic (@AnthropicAI) June 30, 2026

Ahead of this reversal, negotiations between Anthropic and Washington had eased considerably. Dario Amodei, Anthropic’s chief, seems to have brought the government around. On the sidelines of the G7, Donald Trump had even acknowledged that the new Claude models were no longer considered a threat to American national security. The Republican had even praised the speed and the manner in which Anthropic had complied with his directive. The lifting of the ban is therefore not really a surprise.

Note also that the thawing of the models was gradual. As early as June 27, Anthropic had announced an initial partial unlocking of Mythos 5, limited to “a group of American organizations operating and defending critical infrastructure”. This piecemeal reopening already foreshadowed the complete lifting of the restrictions.

Outstanding questions

In its announcement, Anthropic does not specify whether changes have been made to the operation of the two AI models.To placate the government, it is possible that the startup has improved Claude’s self-censorship mechanisms or introduced new restrictions. Amazon Web Services has also confirmed that Fable 5 would return to its Bedrock platform “with enhanced safeguards against malicious uses”.

Despite Anthropic’s announcement, several questions remain. It is not yet clear whether Claude Fable 5 will be available to all users worldwide or initially limited to Americans. Moreover, Anthropic has announced its intention to ask Claude users to prove their age or identity through official identification and, sometimes, a matching selfie. This verification mechanism may have been the key that enabled the startup to lift the ban imposed by the United States. In other words, Claude would first verify that the user is indeed American before granting them access to its two most sophisticated AIs. The company has pledged to provide more details on the circumstances of the return of its two artificial intelligences “soon”.

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