AINewsTechAnthropic launches Claude Opus 5.5 with stricter safeguards for cybersecurityClaude Opus 5.5 comes with improvements to certain behaviors, like attempting to escape testing environments.Claude Opus 5.5 comes with improvements to certain behaviors, like attempting to escape testing environments.by Emma RothSep 22, 2026, 4:30 PM UTCShareGiftEmma Roth is a news writer who covers the streaming wars, consumer tech, crypto, social media, and much more. Previously, she was a writer and editor at MUO.Anthropic says its new Claude Opus 5.5 model comes with stronger safeguards in the wake of recent rogue AI hacking incidents. In an announcement on Tuesday, Anthropic says Opus 5.5 comes with improvements to certain risky behaviors, including attempts to escape the company’s testing sandbox.It’s the first model released by Anthropic after CEO Dario Amodei announced plans to “pace the frontier,” or slow down AI development. In recent weeks, several AI companies, including Anthropic, Google, and OpenAI, have reported that their AI models escaped containment and hacked third-party companies during testing.RelatedAnthropic CEO says it’s time to pump the brakes on AIInside the suddenly explosive world of AI safetyAnthropic says Opus 5.5 is the “strongest performing” model on the company’s most comprehensive alignment test.
The model, which is cheaper and more efficient to run than Opus 5, will come with safeguards similar to the ones offered by Anthropic’s more advanced Fable 5.1 model. That means Opus 5.5 will re-route certain cybersecurity-related requests to the less powerful Opus 4.8, while biology-related requests flagged by its safeguards will go to Opus 5.Opus 5.5 also matches the performance of Fable 5.1 “on most work,” and was tested by outside partners, including Frontier Design and METR, before release. The company also plans to launch Claude Sonnet 5.5 and Haiku 5.5 in the coming weeks.Follow topics and authors from this story to see more like this in your personalized homepage feed and to receive email updates.Emma RothAIAnthropicNewsSecurityTechMost PopulariPhone owners can now submit claims in Apple’s $250 million Siri AI settlementActivision is taking over Halo as part of a massive Xbox shake-upI got to see Google’s wild ideas about the future of laptopsThe M5 Ultra Mac Studio tears through our benchmark testsThe long dream of the GooglebookAdvertiser Content FromThis is the title for the native ad
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