GPT5Pro
GPT-5 pro uses more compute to think harder and provide consistently better answers. GPT-5 pro is available in the Responses API only to enable support for multi-turn model interactions before responding to API requests, and other advanced API features in the future. As the most advanced reasoning model, GPT-5 pro defaults to (and only supports) reasoning.effort: high. GPT-5 pro does not support code interpreter.
400,000 context window 272,000 max output tokens Sep 30, 2024 knowledge cutoff Reasoning token support