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GPT-5.5 in the API | OpenAI | Chasing Next

OpenAIapi

April 24, 2026·Source

GPT-5.5 in the API

GPT-5.5 and GPT-5.5 Pro are now available to developers through the OpenAI API.

Details

GPT-5.5 is priced at $5 per million input tokens and $30 per million output tokens, double GPT-5.4
GPT-5.5 Pro is priced at $30 per million input tokens and $180 per million output tokens

Best for

developers building tools and agents that need OpenAI's newest agentic model

When to use it

you want to wire GPT-5.5's long-task and tool-use behavior into your own product or workflow

Who benefits

developers on the OpenAI API

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