OpenAI targets cyber defenders with GPT-5.5
OpenAI has released GPT-5.5-Cyber to vetted cyber defenders, giving them reduced guardrails for specialized security workflows.OpenAIs GPT-5.5-Cyber is the most permissive model in its lineup, available in limited preview to approved partners doing advanced security work.Vetted teams can use it for bug hunting, malware analysis, and reverse engineering, but malware writing and credential theft remain blocked.The launch follows rival Anthropics Claude Mythos Preview rollout a month earlier, which drew investor and government attention. OpenAI released GPT-5.5-Cyber on May 7 in limited preview, targeting security professionals defending critical infrastructure. The company describes it as the most permissive model in its cybersecurity lineup, aimed at specialized authorized workflows for a smaller group of approved partners with stronger verification requirements and account-level controls. The cyber-specific version makes it easier for vetted teams to use OpenAIs latest model for vulnerability identification, patch validation, and malware analysis, workflows where the guardrails built into the generally available GPT-5.5 would have created friction. OpenAI said: “GPT-5.5-Cyber lets a smaller set of partners study advanced workflows where specialized access behavior may matter.” What defenders can and cannot do Defenders approved for the highest tier of OpenAIs Trusted Access for Cyber program receive a version of GPT-5.5 with fewer guardrails than the public model,