OpenAI releases GPT-5.5-Cyber, achieving top CyberGym score.

OpenAI has launched the full version of GPT-5.5-Cyber as part of its expanded Daybreak cybersecurity initiative. The model achieved the highest single-model result ever recorded on the CyberGym benchmark, surpassing previous competitors. This advanced AI is positioned as a defensive tool for vetted security organizations and government agencies.