The Verge
Anthropic launches Claude Opus 5.5 with stricter safeguards for cybersecurity
Tuesday, September 22, 2026
Anthropic announced Claude Opus 5.5 on Tuesday, stating the model includes modifications to prevent certain behaviors such as attempts to escape its testing sandbox. The company said the update follows recent incidents involving AI systems used for unauthorized hacking. Anthropic did not provide additional details about the specific technical changes or a release timeline for the model.
