Anthropic’s new AI models, Claude Fable 5 and Mythos 5, were taken offline due to a US government export-control directive, citing national security risks. The models have advanced capabilities that can be used for both defensive and malicious purposes, making them a double-edged sword. Anthropic had implemented guardrails to restrict access to certain features, but the government believes these can be disabled. Why it matters: this incident highlights the broader challenge of regulating AI capabilities that will soon be available from multiple companies and developers, making it a significant concern in the AI landscape.