US export-control directive forces Anthropic to suspend Claude Mythos 5 and Fable 5 worldwide

Anthropic spent the weekend in a public standoff with the Trump administration after a Friday-evening directive citing national-security and export-control authorities ordered it to block foreign nationals — both inside and outside the United States — from accessing its newest frontier models, Claude Fable 5 and Mythos 5. Rather than attempt to filter users by nationality at inference time (which developers argue is technically infeasible), Anthropic disabled access to both models worldwide, cutting off its own non-citizen employees in the process. The action came just 72 hours after the models launched, with Fable 5 having reached general availability on Amazon Bedrock on June 9.

The directive followed reports of a 'jailbreak' that could bypass the models' safety safeguards around advanced cybersecurity capabilities. Cybersecurity expert Katie Moussouris, who reviewed the White House report at Anthropic's request, noted the demonstration involved IT experts asking Fable to help find and patch bugs and that the model actually refused to weaponize deliberately insecure code — undercutting the severity framing. Anthropic maintains both models passed extensive pre-deployment safety testing.

The episode is unprecedented: regulators used export-control authority to pull an already-deployed commercial model offline globally, a precedent the Washington Post warns could reshape how governments intervene in shipped AI. Critics including G7 figures and developers across r/singularity and r/Anthropic called the foreign-national restriction unworkable and selectively enforced, noting comparable capabilities exist in GPT-5.5 and Opus models that face no ban. Watch for whether Anthropic relocates operations, whether the models return US-only, and how the AWS partnership fares given Amazon's reported role.