AI NewsOpenAI CEO Sam Altman Teases GPT-5.5 Cyber AI Model Rollout, Could Take On Anthropic’s Claude Mythos

OpenAI CEO Sam Altman Teases GPT-5.5 Cyber AI Model Rollout, Could Take On Anthropic’s Claude Mythos

6:21 PM IST · April 30, 2026

OpenAI CEO Sam Altman teased the successor to the GPT-5.4 Cyber artificial intelligence (AI) model on Thursday. Dubbed GPT-5.5 Cyber, the model was announced just a fortnight after the San Francisco-based AI giant introduced its first cybersecurity model. Not a lot is known about the model currently, but it is expected to follow the same limited release format as the predecessor. The model is said to be competing with Anthropic's Claude Mythos, and offers similar real-world vulnerability detection prowess.