GPT 5.5: What It Is, Key Features, Benchmarks, How to Use It
GPT-5.5 is OpenAI’s April 23, 2026 frontier release for complex, real-world work. It is designed to understand tasks earlier, ask for less guidance, use tools more effectively, check its work, and keep going until the job is done. OpenAI says it is rolling out to Plus, Pro, Business, and Enterprise users in ChatGPT and Codex, while API access is in CometAPI.