GPT-5.5 is our newest frontier model for the most complex professional work. Learn more in our latest model guide. Reasoning.effort supports: none, low, medium (default), high and xhigh.
Context
1.1M
tokens
Input
$5.00
per 1M tokens
Output
$30.00
per 1M tokens
OpenAI: GPT-5.5 sits in the Frontier tier on our leaderboard, ranked #4 of 551 published models on overall intelligence. At $5.00 input and $30.00 output per 1M tokens, it is among the most expensive on the market. It offers an exceptionally large context window suited to long-document workflows and supports tool use, function calling, vision, and reasoning.
