Anthropic Suspends Claude Fable 5 and Mythos 5 Access for All Customers Over US Government Directive Citing National Security Risk
English summary
Anthropic revoked access to its Claude Fable 5 and Mythos 5 models just three days after launch, affecting all customers worldwide. The suspension follows a US government directive based on claims of a possible jailbreak that poses a national cybersecurity risk, though Anthropic contests the evidence as verbal and narrow. The move disrupted downstream products and benchmarks and triggered debate on model sovereignty and reliance on single frontier vendors. Anthropic reset rate limits to mitigate impact but the incident sets a precedent for government-influenced model availability.
Chinese summary
Anthropic 在发布 Claude Fable 5 和 Mythos 5 仅三天后，因美国政府指令以可能的越狱漏洞构成国家安全风险为由，暂停了全球所有客户的访问权限。Anthropic 质疑政府仅提供了口头证据，且认为该漏洞影响范围有限。此次暂停导致下游产品和基准评测中断，并引发关于模型主权和单一前沿供应商依赖风险的讨论。Anthropic 随后重置了速率限制以缓解影响，此事为政府干预模型可用性开创了先例。
Key points
Anthropic suspended Claude Fable 5 and Mythos 5 access for all users globally, not just US government entities, due to a US government directive claiming a national cybersecurity risk from a possible jailbreak.
Anthropic 应美国政府指令，以可能的越狱漏洞构成国家安全风险为由，暂停了全球所有用户对 Claude Fable 5 和 Mythos 5 的访问，而非仅限于美国政府机构。
Anthropic disputes the directive, stating the government provided only verbal evidence of a narrow, non-universal jailbreak, and that similar capabilities exist in other models like GPT-5.5.
Anthropic 对该指令提出异议，称政府仅提供了关于一个有限、非普遍越狱漏洞的口头证据，且类似能力已广泛存在于 GPT-5.5 等模型中。
The suspension caused immediate disruption across downstream products like Cognition/Devin and Agent Arena, and highlighted the geopolitical risk of relying on a single closed frontier API.
暂停访问立即中断了 Cognition/Devin 和 Agent Arena 等下游产品，并凸显了依赖单一封闭式前沿 API 的地缘政治风险。
Anthropic later reset 5-hour and weekly rate limits to soften impact, but the incident reinforces the need for infrastructure sovereignty and the ownership of model stacks.
Anthropic 随后重置了 5 小时和每周速率限制以减轻影响，但该事件强化了基础设施主权和模型栈自主可控的必要性。