GPT-5.5 is OpenAI’s flagship model, released on April 24, 2026. It is positioned as the smartest and most intuitive model OpenAI has built — understanding what you’re trying to do faster and carrying more of the work itself.
It excels at writing and debugging code, researching online, analyzing data, creating documents and spreadsheets, operating software, and moving across tools until a task is finished. Available through the OpenAI API.