Anthropic 发布 Claude Opus 5，安全防护强于前代且接近 Fable 5 能力

在Anthropic最近与美国政府的一次正面交锋几周后，以及在OpenAI发生一次主导科技行业讨论的安全事件几天后，Anthropic于周四发布了其最新模型Claude Opus 5。

公司在一份声明中表示，Opus 5在许多领域“接近Claude Fable 5的能力”，并且在复杂编码任务方面表现更佳。（Fable 5是面向公众的Mythos级模型，引起了政府的不满，与Mythos 5一同被下线数周，随后重新上线，并拥有比之前更强的网络安全保障。）

Fable 5引发的关注——以及随之而来的Anthropic与政府的数周谈判——开启了特朗普政府时期AI监管的新篇章。不久之后，当OpenAI发布GPT-5.6时，该版本经历了大约两周的试验期，仅向获政府批准的实体进行有限预览。

Anthropic承诺为Opus 5提供更强的网络安全保障

当被问及在公开发布前是否向特朗普政府提交Opus 5进行审核时，Anthropic发言人Danielle Ghiglieri告诉The Verge：“我们将继续与政府合作伙伴合作，对我们的模型进行独立测试。这包括Opus 5。”

Anthropic特别将Opus 5推向企业客户，称其最适合知识工作和生物学领域，是理想的日常模型，而Fable 5仍然适用于最雄心勃勃的工作类型和长远的AI代理项目。但公司在一份声明中谨慎表示，Opus 5在网络安全保障方面比其前身Opus 4.8更强，并且“是最符合规范的Opus模型，最不容易被误导用于不当用途。”

随着新型号的发布，公司似乎也在悄然回应最近关于所谓隐藏使用上限的争议——这已经导致至少一场诉讼：https://finance.yahoo.com/sectors/technology/articles/anthropic-faces-lawsuit-over-claude-150710669.html——以及 AI 的资金压力：/ai-artificial-intelligence/917380/ai-monetization-anthropic-openai-token-economics-revenue，或者对 AI 实验室成本以新方式转嫁给客户的担忧。按每百万令牌计算，Opus 5 的定价与其前身相同（输入 5 美元 / 输出 25 美元），Anthropic 指出它是 Fable 5 的“半价”。它的价格也略低于 OpenAI 的 GPT-5.6：/ai-artificial-intelligence/957845/openai-gpt-5-6-trump-administration-ai-preview。

客户还可以为 Opus 5 选择“快速模式”（这是今天在研究预览中推出的功能），以获得更高的速度，但价格翻倍。还有一个选项，可以在安全机制要求 Opus 5 拒绝用户请求时自动回退到低等级模型。

Weeks after Anthropic’s latest toe-to-toe with the US government, and days after an OpenAI security incident：/ai-artificial-intelligence/968988/openai-hugging-face-hack-ai 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：/ai-artificial-intelligence/950412/anthropic-trump-adminstration-claude-mythos-fable-5-export-controls for a few weeks along with Mythos 5, and then brought back：/ai-artificial-intelligence/958964/anthropic-claude-fable-5-is-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：/ai-artificial-intelligence/957845/openai-gpt-5-6-trump-administration-ai-preview, 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：https://finance.yahoo.com/sectors/technology/articles/anthropic-faces-lawsuit-over-claude-150710669.html — and the AI money squeeze：/ai-artificial-intelligence/917380/ai-monetization-anthropic-openai-token-economics-revenue, 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：/ai-artificial-intelligence/957845/openai-gpt-5-6-trump-administration-ai-preview 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.