Anthropic restores AI models Fable, Mythos after the U.S. lifts export controls

Anthropic restores access to its two most advanced AI models after the U.S. government lifted the export controls that forced it to pull them last month. The controls on Claude Fable 5 and Claude Mythos 5 were removed on June 30, the company said.

Fable 5 returns globally on July 1 across Anthropic's platforms, while Mythos 5, which shares the same underlying model but carries fewer safety restrictions, is being restored to a set of U.S. organizations after government approval on June 26.

The freeze dated to June 12, when the government applied export controls, rules that limit which foreign nationals can access a technology, to both models. Because the order took effect immediately and Anthropic could not verify users' nationality in real time, it suspended access for everyone rather than risk breaching the rule.

Trigger and Response

The trigger was a cybersecurity finding after Amazon researchers reported a way to bypass Fable 5's safeguards, a technique known as a jailbreak, prompting the model to identify software vulnerabilities and, in one case, produce code showing how one could be exploited.

Anthropic is privately held, but traders have wagered on its value through a pre-IPO perpetual, a futures contract with no expiry date, listed on the onchain exchange Hyperliquid. CoinDesk reported that the contract fell about 3.7% when access was suspended in June, as the shutdown raised questions about the timing of any public listing.

Deeper Government Collaboration

Meanwhile, Anthropic said it is deepening its collaboration with the U.S. government, including:

• Giving designated agencies early access to frontier models and their safeguards before public release
• Sharing threat intelligence
• Working toward a common security standard across AI developers

It is also drafting a framework with Amazon, Microsoft and Google for scoring how dangerous a given jailbreak is.

The arrangements tie into a June 2 executive order on AI security and point to a tighter link between frontier AI releases and government review, a shift that will draw both support as responsible practice and scrutiny over how much say Washington gets in which models ship.