Anthropic 发布 Opus 5，能力“接近” Fable 5

在 Anthropic 最近一次与美国政府正面交锋数周之后、以及 OpenAI 一起主导科技行业讨论的安全事件发生数天后，Anthropic 于周四发布了其最新模型 Claude Opus 5。

该公司在一份公告中表示，Opus 5“在许多领域接近 Claude Fable 5 的能力”，且在复杂编程任务上表现优异得多。（Fable 5 是面向公众的 Mythos 级模型，曾引发政府不满；它与 Mythos 5 一同被下线数周，随后又以比此前更强的网络安全防护措施被重新上线。）

围绕 Fable 5 的担忧，以及 Anthropic 与政府随后数周的谈判，开启了特朗普政府 AI 监管的新时代。不久之后，当OpenAI 发布 GPT-5.6时，该模型经历了约两周的某种试运行期，仅向获得政府批准的实体进行有限预览发布。

Anthropic 承诺为 Opus 5 提供更强的网络安全防护

当被问及 Anthropic 是否在此次公开发布前将 Opus 5 提交给特朗普政府审查时，Anthropic 发言人 Danielle Ghiglieri 告诉 The Verge：“我们将继续与政府合作伙伴协作，由他们对我们的模型开展独立测试，其中包括 Opus 5。”

Anthropic 正特别面向企业客户推广 Opus 5，称其最适合知识工作和生物学任务，也是理想的日常模型；而 Fable 5 仍最适合最具雄心的工作类型及长周期 AI Agent 项目。不过，该公司在公告中谨慎强调，其网络安全防护能力强于前代 Opus 4.8，并称它是“对齐程度最高的 Opus 模型，也最不容易被诱骗用于滥用”。

随着新模型发布，该公司似乎也在含蓄回应近期有关其疑似设置隐藏使用上限的争议——这已导致至少一起诉讼——以及AI 资金挤压问题，即外界担忧 AI 实验室正以新方式将成本转嫁给客户。按每百万 token 计算，Opus 5 的定价与前代相同（输入 5 美元 / 输出 25 美元）；Anthropic 还强调，其价格仅为 Fable 5 的“一半”。它的价格也比 OpenAI 的 GPT-5.6略低。

客户还可为 Opus 5 选择“Fast mode”（该功能于今日以研究预览形式推出），以双倍价格获得更高速度。此外，当安全机制要求 Opus 5 拒绝用户请求时，客户还可以选择启用自动回退至低阶模型的功能。

Weeks after Anthropic’s latest toe-to-toe with the US government, and days after an OpenAI security incident that dominated tech industry discussions, Anthropic on Thursday released its newest model, Claude Opus 5.

The company said in a release that Opus 5 “comes close to the capabilities of Claude Fable 5 in many domains” and is much better at complex coding tasks. (Fable 5 is the public-facing Mythos-class model that drew the government’s ire, was taken offline for a few weeks along with Mythos 5, and then brought back with even stronger cyber safeguards than before.)

The Fable 5 concerns — and the ensuing weeks of negotiations between Anthropic and the government — kicked off a new era of AI regulation for the Trump administration. Soon after, when OpenAI released GPT-5.6, it underwent a roughly two-week trial period of sorts, rolling out in limited preview solely to government-approved entities.

Anthropic promises stronger cybersecurity safeguards with Opus 5

When asked whether Anthropic ran Opus 5 by the Trump administration before this public rollout, Anthropic spokesperson Danielle Ghiglieri told The Verge , “We continue to work with our government partners to conduct their own independent testing of our models. This includes Opus 5.”

Anthropic is marketing Opus 5 especially to its enterprise customers, saying it’s best for knowledge work and biology and that it’s the ideal everyday model, with Fable 5 still being best for the most ambitious types of work and long-horizon AI agent projects. But the company was careful to say in a release that it has stronger cybersecurity safeguards than its predecessor, Opus 4.8, and that it’s “the most aligned Opus model and is the least susceptible to being tricked into misuse.”

With the new model’s release, the company also seems to subtly address recent controversies over allegedly hidden usage caps — which have led to at least one lawsuit — and the AI money squeeze, or concerns that AI labs’ costs are being passed onto their customers in new ways. Per million tokens, pricing for Opus 5 is the same as its predecessor ($5 input / $25 output), and Anthropic made the point that it’s “half the price” of Fable 5. It’s also slightly cheaper than OpenAI’s GPT-5.6.

Customers can also choose “Fast mode” for Opus 5 (a feature that’s being launched today in research preview), to get higher speeds for double the price. There’s also an option to opt in to automatic fallbacks to a lower-tier model when safeguards mandate that Opus 5 declines a user’s request.