‘Fix this code’—The three little words behind the U.S. government decision that shut down Anthropic’s Fable and Mythos AI models

The U.S. government imposed export controls on Anthropic’s Fable 5 and Mythos 5 AI models after Amazon researchers discovered a security vulnerability triggered by the phrase 'fix this code,' enabling the models to generate exploitable security patches. Anthropic disabled the models for all users to comply with export regulations affecting non-citizen access.