OpenAI Limits Access to New Cybersecurity Tool GPT-5.5 Cyber, Following Anthropic’s Mythos Restrictions

OpenAI is set to phase in its latest cybersecurity testing tool, GPT-5.5 Cyber, initially providing access exclusively to select critical cyber defenders. This move comes shortly after OpenAI criticized Anthropic for constraining its Mythos platform, signaling a cautious approach to the deployment of powerful AI tools in security settings.