Model
GPT-5.5
OpenAI's flagship model for agentic work and coding, with strong terminal/SWE benchmark gains over GPT-5.4.
Closed sourcereasoningGPT-5.5generally availableReleased 2026-04-231M context128K max outputOpenAIOfficial page
Model metadata
Modalities: text, imageInput: $5.00/MTokOutput: $30.00/MTokAPI ID: gpt-5.5