US Government Blocks Foreign Access to Anthropic's Fable 5 and Mythos 5 Over Cyber Weapon Concerns

The Department of Commerce restricted international access to Anthropic's latest models after Amazon CEO Andy Jassy warned that a Fable 5 jailbreak could enable adversaries to build cyber weapons. The move marks a new phase of AI export controls.

The US government has moved to block foreign access to Anthropic's Claude Fable 5 and Mythos 5 models, a coordinated action that Andrew Ng flagged publicly and that was reported across AI roundups on Saturday. The restriction reportedly followed a direct warning from Amazon CEO Andy Jassy to the Department of Commerce that a successful jailbreak of Fable 5 could give adversarial state actors the capability to develop cyber weapons.

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