GPT-5.5
OpenAI · 2026-04-23
GPT-5.5 is OpenAI's frontier reasoning model for complex professional work, released as its smartest and most intuitive model to date. It accepts text and image inputs, supports configurable reasoning effort values of none, low, medium, high, and xhigh, and shows especially strong gains in agentic coding, computer use, knowledge work, and early scientific research.