US Government Suspends Access to Anthropic's Fable 5 and Mythos 5 Models

On June 12, 2026, the US government issued a directive to Anthropic, mandating the suspension of access to its AI models Fable 5 and Mythos 5 for all foreign nationals. This includes foreign national employees of Anthropic, both inside and outside the United States. The government cited national security concerns, specifically a potential method to bypass the models' safeguards. Anthropic has complied with the directive, disabling access to these models for all customers. The company disagrees with the government's assessment, arguing that the identified vulnerabilities are minor and could be exploited by other publicly available models. Anthropic is working to restore access as soon as possible. The directive does not affect access to other Anthropic models. This situation raises concerns about the implications for AI model deployment and national security.

Key Points: • US government orders Anthropic to suspend access to Fable 5 and Mythos 5 for foreign nationals. • The directive is based on potential vulnerabilities that could allow bypassing model safeguards. • Anthropic disagrees with the government's assessment and is seeking to restore access quickly.