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On Friday, Anthropic launched its Opus 5 model, the newest version of its long-standing heavyweight model. While smaller than Fable 5, the model will be both cheaper and less restrictive than Fable, likely making it preferable in most use cases.
Notably, Opus 5 actually outperforms Fable 5 on a number of benchmarks included in the announcement.
Opus 5 is launching only two months after Opus 4.8, which became available on May 28. Mythos 5, Fable 5, and Sonnet 5 all launched in June, leaving only the lightweight Haiku model still waiting for an upgrade to the 5 series.
In a post announcing the new model：https://www.anthropic.com/news/claude-opus-5, Anthropic emphasized that Opus 5 was “much stronger at verifying its work and iterating carefully until it succeeds,” citing benchmark testing, in which Opus 5 wrote its own computer vision pipeline in response to an incomplete prompt, among other examples.
There are still meaningful safeguards on Opus, particularly around cybersecurity tasks like exploit generation and penetration testing. For instance, Opus 5 safeguards prevent it from being used to scan for vulnerabilities in a software binary, although it is permitted to search for vulnerabilities in source code, since the latter task is more likely to be used for defensive purposes.
Broadly, Anthropic expects these classifiers to engage 85% less often for Opus 5 than they will for Fable 5, a reflection of the lighter touch given to the less capable model.
Anthropic is also rolling out a new tool to make the safeguards less disruptive：https://techcrunch.com/2026/07/23/how-ai-guardrails-are-impeding-the-work-of-offensive-cybersecurity-researchers/ when they do engage. Users can now opt in to a beta feature called Automatic Fallbacks, which will automatically route requests to a less powerful model when a prompt triggers the safety classifier. The result is that API users with the setting engaged will get a functional response instead of an error message.
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情报判断
Aioga 编辑摘要
Anthropic 推出旗舰模型 Opus 5。材料称其在公告列出的多项基准测试中超过 Fable 5，价格更低、限制更少，并可通过测试中的 Automatic Fallbacks 功能，在安全分类器触发后将请求转交给较弱模型处理。
背景分析
Opus 5 在 Opus 4.8 发布约两个月后推出；材料还称 Mythos 5、Fable 5 和 Sonnet 5 已于六月发布。Anthropic 强调，新模型更擅长核验工作并持续迭代，但相关说法主要依据其公告及其中列出的测试案例。
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