Anthropic launches Opus 5 | TechCrunch

On Friday, Anthropic launched the Opus 5, the latest version of its long-running heavyweight model. Although the model is smaller than the Fable 5, it will be cheaper and less restrictive than the Fable, which will likely make it preferable in most use cases.

Notably, Opus 5 actually outperforms Fable 5 on a number of criteria listed in the announcement.

Opus 5 launches just two months after Opus 4.8, which became available on May 28. The Mythos 5, Fable 5 and Sonnet 5 were launched in June, leaving only the lightweight Haiku model still waiting for an upgrade to the 5 Series.

In a post announcing the new modelAnthropic asserted that Opus 5 was “much stronger at validating its operation and carefully iterating until it succeeds,” citing benchmark testing, where Opus 5 wrote its own computer vision pipeline in response to an incomplete prompt, among other examples.

More importantly, Opus 5 is also free of many of the limitations that have hampered Fable since its release. Like its predecessor, Opus 5 is not subject to 30 day data retention policy That covers Fable and Mythos, which has raised concerns among some privacy-conscious users.

There are still meaningful safeguards in Opus, especially for cybersecurity tasks like vulnerability generation and penetration testing. For example, the Opus 5 safeguards prevent it from being used to scan for vulnerabilities in binary software, although scanning for vulnerabilities in source code is permitted, since the latter task is more likely to be used for defensive purposes.

Overall, Anthropic expects these rankers to interact with Opus 5 85% less than they do with Fable 5, a reflection of the lighter touch given to the less capable model.

Anthropic is also rolling out a new tool for Make safeguards less disruptive When they engage. Users can now opt in to a beta feature called Auto Undo, which will automatically route requests to a less robust form when a prompt triggers a security classifier. The result is that API users who have the setting turned on will get a functional response instead of an error message.