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

OpenAI CEO Sam Altman speaks during the BlackRock Infrastructure Summit on March 11, 2026, in Washington. Anna Moneymaker | Getty Images OpenAI on Thursday announced that GPT-5.5-Cyber, a variation of its latest artificial intelligence model, is rolling out in a limited preview capacity to vetted cybersecurity teams, a month after rival Anthropic captivated investors and government officials with Claude Mythos Preview . …