Cybersecurity Experts Urge US to Lift Ban on Anthropic's Frontier AI Models

The US government issued an export-control directive suspending foreign-national access to Anthropic’s new LLMs, Fable 5 and Mythos 5, after research allegedly showed a technique to bypass guardrails and expose minor vulnerabilities; Anthropic temporarily blocked access for all customers to comply. A group of 54 cybersecurity leaders publicly urged lifting the ban and called for transparent risk assessments, arguing the action removes defensive capabilities and creates market uncertainty.