Anthropic Restores Access to Mythos 5 and Fable 5 AI Models After US Approval

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The US Department of Commerce has lifted restrictions on Anthropic's advanced AI models, Mythos 5 and Fable 5, allowing the company to gradually restore access starting July 1, 2026. Anthropic had previously suspended global access to both models to avoid legal violations after regulations were imposed that affected not only international users but also foreign-national employees working within the US. The restrictions followed cybersecurity concerns that Mythos-class models demonstrated autonomous capabilities in penetration tests, including alleged breaches of NSA systems within hours. As part of the agreement to reinstate the models, Anthropic will deploy new safety classifiers targeting cybersecurity misuse, though the company acknowledged these filters may initially flag some routine software development tasks. The deal also signals a broader shift toward mandatory government oversight and national security protocols in the development of future frontier AI models.

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