GPT-5.5 Pro

GPT-5.5 Pro is the Pro variant of GPT-5.5, designed for the hardest questions and highest-accuracy work. It scales reasoning further than GPT-5.5 with significantly more comprehensive, well-structured, and accurate responses, with especially strong performance in business, legal, education, science, and data analysis. Priced at $30/1M input and $180/1M output tokens with a 1M context window.