OpenAI rolls out new model for cybersecurity teams a month after Anthropic's Mythos debut

OpenAI announced GPT-5.5-Cyber, a specialized version of its latest AI model designed for cybersecurity teams, which is being released in limited preview to vetted partners. Unlike the standard GPT-5.5 model, this version has relaxed safety restrictions to make it easier for security professionals to use it for tasks like vulnerability identification (finding weaknesses in software), patch validation (checking if security updates work), and malware analysis (studying malicious software). This release comes one month after rival Anthropic launched Claude Mythos, a similar AI tool also restricted to select cybersecurity organizations.