Announcements 公告

Statement on the US government directive to suspend access to Fable 5 and Mythos 5

关于美国政府下令暂停访问《Fable 5》和《Mythos 5》的声明

2026年6月12日

The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees. The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance. Access to all other Anthropic models will not be affected. 美国政府援引国家安全法规，发布了一项出口管制指令，要求暂停所有外国公民（无论身处美国境内还是境外）对 Fable 5 和 Mythos 5 的访问权限，其中包括 Anthropic 的外国籍员工。该指令的实际影响是，为确保合规，我们必须立即暂停所有客户对 Fable 5 和 Mythos 5 的访问权限。其他所有 Anthropic 模型的访问权限将不受影响。

We received the directive from the government today at 5:21pm (ET). The letter did not provide specific details of its national security concern. Our understanding is that the government believes it has become aware of a method of bypassing, or “jailbreaking” Fable 5. We reviewed a demonstration of this specific technique being used to identify a small number of previously known, minor vulnerabilities. These vulnerabilities all appear relatively simple, and we have found that other publicly-available models are able to discover them as well without requiring a bypass. 我们于今天下午 5 点 21 分（美国东部时间）收到了政府的指令。该函件并未提供有关其国家安全担忧的具体细节。据我们了解，政府认为其已掌握了一种绕过（或称“越狱”）Fable 5 的方法。我们审查了该技术被用于识别少量已知轻微漏洞的演示。这些漏洞看似相对简单，且我们发现其他公开可用的模型同样能够发现这些漏洞，无需进行绕过操作。

Anthropic’s posture with respect to Fable’s safeguards, as laid out in our launch blog post, is the following: 正如我们在发布博文中所阐述的，Anthropic 对 Fable 安全保障措施的立场如下：

We have instituted strong safeguards that greatly reduce the likelihood that Fable is misused for tasks related to cybersecurity (among others). In fact, our safeguards are so strong that many users have complained that they are overly broad. 我们已实施了强有力的防护措施，大大降低了 Fable 被滥用于网络安全（及其他）相关任务的可能性。事实上，我们的防护措施如此严密，以至于许多用户抱怨其范围过于宽泛。
In the weeks leading up to the launch of Fable, Anthropic worked with the US government, the UK AISI, multiple private third-party organizations and internal teams to red-team Fable’s safeguards for thousands of hours in total. 在《Fable》发布前的几周里，Anthropic 与美国政府、英国人工智能安全研究所（AISI）、多家私营第三方机构以及内部团队通力合作，对《Fable》的安全防护措施进行了总计数千小时的红队测试。
These tests showed that Fable’s safeguards are substantially more effective than those of any previously deployed model. 这些测试表明，Fable 的安全防护措施比此前部署的任何模型都要有效得多。
No testers have yet been able to find a universal jailbreak—a jailbreak method that can very broadly bypass the model’s safeguards, unblocking a wide range of cyber capabilities. 目前尚无测试人员能够找到一种通用的越狱方法——即一种能够广泛绕过该机型安全防护机制、从而解锁大量网络功能的越狱方法。
We suspect that perfect jailbreak resistance is not currently possible for any model provider. Every safeguard used in the industry is vulnerable to non-universal jailbreaks (which can elicit some cyber information in specific circumstances), and it is likely that universal jailbreaks will eventually be found in the future. We stated this clearly when we released Fable 5. 我们认为，目前没有任何设备制造商能够实现完全防越狱。业内采用的每项安全措施都可能受到非通用越狱工具的攻击（这些工具在特定情况下可能泄露部分网络信息），而且未来很可能出现通用越狱工具。我们在发布 Fable 5 时已对此作了明确说明。
Given that perfect jailbreak resistance does not appear to be possible today, Anthropic adopted a defense in depth strategy with Fable 5. We aimed to make jailbreaks either narrow (in the case of non-universal jailbreaks) or very expensive to produce (in the case of universal jailbreaks), and to combine this with thorough monitoring to quickly detect and shut down any successful attacks. This is also why Anthropic has required 30-day retention of customer data with Fable—a policy change that carries real costs for us with customers, but that allows us to research and mitigate jailbreaks. 鉴于目前似乎无法实现完美的越狱防护，Anthropic 在 Fable 5 中采用了深度防御策略。我们的目标是让越狱攻击要么范围有限（针对非通用型越狱），要么实施成本极高（针对通用型越狱），并结合全面的监控机制，以快速检测并阻止任何成功的攻击。这也是 Anthropic 要求 Fable 必须保留客户数据 30 天的原因——这一政策变更虽然会给我们带来实际的客户成本，但能让我们研究并缓解越狱风险。
We stand by this defense in depth strategy. It reduces the risks posed by Fable, making them comparable to the risks of existing models already deployed across the industry. 我们坚持这一多层次防御策略。该策略有效降低了 Fable 带来的风险，使其与业内已部署的现有模型所面临的风险处于同一水平。
We have not even received a disclosure of a concerning non-universal potential jailbreak that led to a harmful result. The potential jailbreaks that have been disclosed to us are either entirely benign responses or are minor findings that provide no Mythos-specific uplift. 我们甚至尚未收到任何关于可能导致有害后果的、非通用型越狱漏洞的披露。目前向我们披露的潜在越狱漏洞，要么是完全无害的应对措施，要么是微不足道的发现，且无法为 Mythos 系统带来任何提升。

To date, the government has only given us verbal evidence of a potential narrow, non-universal jailbreak, which essentially consists of asking the model to read a specific codebase and fix any software flaws. Our understanding is that one potential jailbreak was shared with the government. We have reviewed a report that we believe is the basis of the government's directive and validated that the level of capability displayed there is widely available from other models (including OpenAI’s GPT-5.5), and is used every day by the defenders who keep systems safe. We will share more details over the next 24 hours. 迄今为止，政府仅向我们提供了关于一种潜在的、范围有限且非通用的越狱方案的口头证据，该方案本质上是要求模型读取特定的代码库并修复其中的软件漏洞。据我们所知，曾有一项潜在的越狱方案被提交给了政府。我们审阅了一份报告，认为该报告是政府指令的依据，并验证了其中展示的能力水平在其他模型（包括 OpenAI 的 GPT-5.5）中普遍存在，且被负责维护系统安全的防御人员日常使用。我们将在未来 24 小时内分享更多细节。

We are complying with the government’s legal directive and are removing access to Fable 5 and Mythos 5 for all users. However, we disagree that the finding of a narrow potential jailbreak should be cause for recalling a commercial model deployed to hundreds of millions of people. If this standard was applied across the industry, we believe it would essentially halt all new model deployments for all frontier model providers. 我们正在遵守政府的法律指令，并将对所有用户关闭《Fable 5》和《Mythos 5》的访问权限。然而，我们不同意仅因发现一个狭窄的潜在越狱漏洞，就应以此为由召回已部署给数亿用户的商用模型。如果这一标准在整个行业中普遍适用，我们认为这将实质上导致所有前沿模型提供商暂停所有新模型的部署。

As we have stated publicly, we believe the government should have the ability to block unsafe deployments, as part of a statutory process that is transparent, fair, clear, and grounded in technical facts. This action does not adhere to those principles. 正如我们此前公开声明的那样，我们认为政府应当有权阻止不安全的部署，这应作为一项透明、公平、明确且基于技术事实的法定程序的一部分。此次行动并未遵循这些原则。

We apologize for this disruption to our customers. We believe this is a misunderstanding and are working to restore access as soon as possible. 对于此次给客户带来的不便，我们深表歉意。我们认为这只是一场误会，目前正在努力尽快恢复服务。

Statement on the US government directive to suspend access to Fable 5 and Mythos 5

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