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The US Department of Commerce has lifted export controls imposed on Claude Fable 5 and Claude Mythos 5, Anthropic’s most advanced artificial intelligence models. The decision, communicated on Monday 30 June, puts an end to an 18-day block and from today, Wednesday 1 July, access to Fable 5 will be restored globally on Claude.ai, on the developer platform, on Claude Code and Claude Cowork.
The blockade of June 12th
The story began on June 12, just three days after the launch of the two models, when the American government – citing national security reasons – ordered Anthropic to suspend access to Fable 5 and Mythos 5 for any foreign citizen, inside or outside the United States, including the company’s non-American employees. Unable to filter users by nationality in real time, the company turned off both models for all customers worldwide.
At the origin of the directive there was a jailbreak identified by Amazon researchers: a technique capable of inducing the model to identify software vulnerabilities and, in one case, to write code that demonstrated how to exploit one. Anthropic has always disputed the severity of the flaw, claiming that similar requests also work on less powerful models, including those of the competition.
The agreement with Washington
Commerce Secretary Howard Lutnick explained that the export license will no longer be necessary: in exchange, Anthropic has pledged to proactively identify and correct security risks, help define standards for future models and report any malicious activity to the government.
On a technical level, the company has trained a new security filter – a classifier – that blocks the reported technical specification in over 99% of attempts: intercepted requests are diverted to the previous model, Opus 4.8, with notification to the user. The trade-off, admitted by Anthropic itself, is an increase in false positives on normal programming and debugging requests. The safeguards were reviewed by the Commerce Department’s Center for AI Standards and Innovation (Caisi) before the revocation.
The gradual return and the Mythos node
The return of Fable 5 will be gradual: until July 7 the model is included in the Pro, Max, Team and Enterprise plans up to 50% of the weekly usage limits, before returning to full availability. Access via AWS, Google Cloud and Microsoft Foundry will follow in the coming days. As for Mythos 5 – the more powerful version with fewer restrictions, intended for selected partners – access had already been restored on June 26 for around a hundred American organizations and federal agencies involved in the defense of critical infrastructures.
Industry pressures and China’s shadow
Washington’s about-face also came under pressure from the technology industry: a coalition of cybersecurity officials had signed an open letter calling for the lifting of controls, while several executives and investors warned that the freezing of a flagship American model was giving away precious time to Chinese developers of open source models.
During the blockade, Z.ai’s Chinese GLM-5.2 model had occupied some top positions in the sector benchmarks due to the lack of rivals. Anthropic has also opened a program on HackerOne for reporting new jailbreaks and has pledged to give government partners early access to future Frontier models before release.