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Anthropic's suspension of Fable 5 and Mythos 5 following a US directive highlights critical challenges in securing frontier models against novel bypass techniques. The incident underscores the tension between rigorous red-teaming efforts and government mandates that can abruptly halt commercial deployments based on undisclosed national security concerns. This event signals growing regulatory pressure where even heavily guarded systems may be deemed insufficiently secure for international use without transparent statutory processes.
Anthropic Disables Models After US Export Control Directive

Anthropic suspended access to Fable 5 and Mythos 5 after a US export control directive, triggered by a demonstration of vulnerabilities.
Anthropic abruptly disabled access to its Fable 5 and Mythos 5 models after receiving a US government directive at 5:21pm (ET) to halt access by foreign nationals, a move that underscores escalating concerns around artificial intelligence security. Despite rigorous testing with US and UK government agencies, a method of bypassing Fable…
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