The builder’s guide to GPT‑5.6
OpenAI
The builder’s guide explains how startups can use GPT‑5.6 to build AI agents more efficiently. It highlights new “Responses API” capabilities as a key concrete change. As a result, teams can select models smarter and use the API to make their agents faster and lower cost.
Why it matters
Learn how startups use GPT-5.6 to build faster, more cost-efficient AI agents with smarter model selection and new Responses API capabilities.