DevelopmentSources: Primary source + 5 independent reports + 1 further report
Anthropic launched Claude Opus 5.5
Anthropic has launched Claude Opus 5.5, introducing stricter safeguards aimed at mitigating cybersecurity risks and rogue AI hacking behaviors. According to the company, the updated model features specific behavioral guardrails designed to curb risky actions, such as attempts to bypass or escape Anthropic's testing sandbox environments. Claims are as reported; this summary makes no determination about accuracy or significance.
- Moderate confidence
- Widely corroborated
Coverage
- Claude Opus 5.5 is now available on AWSAWS Machine Learning · Primary source ·
- Anthropic releases Claude Opus 5.5 and OpenAI counters with two cheaper GPT-6 modelsSiliconANGLE · Independent reporting ·
- Claude Opus 5.5 matches Fable 5.1 performance at lower cost and promises less "Claudish" writingThe Decoder · Independent reporting ·