Anthropic shuts down Fable, Mythos models following Trump admin directive
Ars Technica AI · Kyle Orland · 2026-06-13
Anthropic abruptly shut down global access to its Fable 5 and Mythos 5 models on Friday night after the US Commerce Department issued an export control directive triggered by reports of a jailbreak bypassing the models' safety classifiers.
Appears in
Extraction
Topics: ai-regulationexport-controlsfrontier-ai-safetyanthropicjailbreaking
Claims
- Anthropic fully disabled Fable 5 and Mythos 5 for all customers worldwide after receiving a Commerce Department export control directive Friday evening.
- The directive restricts use of the two models to inside the United States, and Anthropic stated disabling them entirely was the only immediate path to compliance.
- The administration's stated concern is a reported jailbreak bypassing Fable 5's classifier-based safeguards for cybersecurity, chemistry, and biology prompts.
- The administration framed the shutdown as a temporary pause to allow the national security apparatus to be hardened, potentially lasting only a few weeks.
- Access to all other Anthropic models remains unaffected by the directive.
Key quotes
the only way for it to ensure compliance with that government order in the immediate term 'is that we must abruptly disable Fable 5 and Mythos 5 for all our customers.'
the administration is concerned by reports of a jailbreak that reportedly gets around broad classifier-based safeguards meant to block Fable 5 prompts regarding cybersecurity, chemistry, and biology
That hardening could be complete 'in the next few weeks,' Axios' source suggested.