Anthropic utterly shut off entry to its Mythos 5 and Fable 5 fashions Friday evening, simply days after they have been launched.
The transfer comes after Anthropic’s receipt of a US Commerce Division directive Friday night, subjecting the brand new fashions to export controls proscribing their use anyplace exterior the US. In a message posted Friday evening, Anthropic stated the one means for it to make sure compliance with that authorities order within the fast time period “is that we should abruptly disable Fable 5 and Mythos 5 for all our prospects.” Entry to different Anthropic fashions will not be affected.
An Axios report cited an administration official saying that the administration is worried by stories of a jailbreak that reportedly will get round broad classifier-based safeguards meant to dam Fable 5 prompts relating to cybersecurity, chemistry, and biology. The administration reportedly requested a pause within the launch of those fashions to realize time for the “nationwide safety equipment” to be “hardened” in opposition to this sort of menace. That hardening could possibly be full “within the subsequent few weeks,” Axios’ supply advised.
In its Friday evening announcement publish, Anthropic stated the federal government has solely offered it with “verbal proof of a possible slender, non-universal jailbreak” that entails getting Fable 5 to assessment a particular codebase for software program flaws. The corporate says it has solely seen proof of this sort of jailbreak getting used to search out “minor” and “comparatively easy” software program vulnerabilities, and that different publicly out there fashions like GPT-5.5 has related capabilities on this rating.
