Anthropic disables Fable and Mythos models following US Commerce Department directive

Anthropic has shut down access to its Mythos 5 and Fable 5 models as of Friday night, shortly after their launch. This decision follows a directive from the US Commerce Department, which imposed export controls on the new models, restricting their use outside the United States. In a statement, Anthropic indicated that to comply with the government order, it must disable these models for all customers, although access to other Anthropic models remains unaffected. An Axios report cited an administration official expressing concerns over a jailbreak that bypasses safeguards intended to block prompts related to cybersecurity, chemistry, and biology. The official noted that the administration requested a pause in the release of these models to allow time for national security measures to be strengthened, with completion expected in the coming weeks.