Anthropic challenges US approach in the Claude Fable 5 and Mythos 5 export control case, responds with jailbreak severity framework
Anthropic challenged the legality and process of the US export controls that led it to temporarily suspend access to the Claude Fable 5 and Mythos 5 models in June 2026. In response, it published a jailbreak severity framework and a program for reporting jailbreaks.