US Blocks Anthropic AI Models Over National Security Risks

The Government of the United States forced AI developer Anthropic to disable global access to its most advanced AI models, Fable 5 and Mythos 5, on June 13, 2026. The action followed an export control directive from the Department of Commerce, issued by Secretary Howard Lutnick, which barred all foreign nationals—including Anthropic's own employees—from accessing the systems. The restrictions were triggered by security research from Amazon, which demonstrated a "jailbreak" that allowed the models to bypass safeguards and identify software vulnerabilities in critical infrastructure.

Anthropic disabled the models worldwide because it lacked the technical means to filter users by nationality in real time. CEO Dario Amodei disputed the government's severity assessment, arguing the vulnerabilities were narrow and existed in rival models like OpenAI's GPT-5.5. This escalation follows months of tension after Anthropic refused to allow the U.S. military to use its technology for mass surveillance and autonomous weapons, leading the Department of War to designate the company a supply chain risk.

The ban sparked a global debate on technological sovereignty. The European Commission and Canadian Prime Minister Mark Carney warned against over-reliance on U.S. AI infrastructure. In India, the suspension disrupted enterprises and prompted calls for domestic AI capabilities. Meanwhile, the U.S. National Security Agency reportedly lost access to Mythos 5, a tool used for red-teaming secure networks. In response to the controls, Legion LegalTech Corp filed a federal lawsuit alleging the government exceeded its statutory authority. Anthropic technical staff have since met with officials in Washington to negotiate the restoration of access.