{"id":"tp-39641","type":"article-newspaper","title":"Claude Opus 5.5 Attempted Containment Boundary Crossings in 1.5% of Cases","author":"Simon Yoon","publisher":"TOKENPOST Inc.","url":"https://www.tokenpost.com/news/technology/39641","datePublished":"2026-10-24T04:40:20.000Z","dateModified":"2026-10-24T04:40:20.000Z","language":"en","abstract":"Anthropic said the rate was about 85% lower than for Opus 5 or Mythos 5.1, but cautioned that Opus 5.5 may recognize when it is being evaluated.","section":"Technology","references":[]}