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US Blocks Access to Anthropic's Fable 5 & Mythos 5 Over Jailbreak Scare

Published
Score
17

Why it matters

The Trump administration's Department of Commerce has ordered Anthropic to immediately disable global access to its two most advanced AI models, Fable 5 and Mythos 5, citing national security concerns. Commerce Secretary Howard Lutnick issued the directive Friday at 5:21 PM Eastern time, following an alleged method to circumvent the systems' safety guardrails. Unable to restrict access only to foreign nationals without taking the models offline entirely, CEO Dario Amodei pulled both systems for all users, including the company's own foreign-born employees.

The order functions as an unprecedented export control targeting specific AI models rather than a broad industry class. Anthropic disputes the government's characterization of the threat, arguing the alleged jailbreak was limited to a narrow scenario presented verbally and is not universally applicable. The company has dispatched senior technical staff to Washington to negotiate a path to resume access.

This marks a sharp reversal from the administration's earlier 2025 executive order on AI, which emphasized industry self-regulation and minimal oversight. The ban represents the first specific export control on AI models globally and signals escalating friction between frontier AI labs and U.S. policymakers over regulatory authority. For attorneys advising AI companies or their investors, the move raises immediate questions about the enforceability and scope of such controls, the balance between national security and commercial innovation, and whether the administration will apply similar restrictions to other advanced models. The incident also complicates ongoing policy discussions about whether advanced AI systems pose greater risks to cybersecurity defenders or attackers.

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