The Decisions API is an OpenAI API that answers fixed-form questions about text, images or JSON, such as whether something is true, which category fits or how severe an issue is.
In plain words
Instead of free text, it returns a typed answer: the chance from 0 to 1 that a condition holds, one option from a list you supply, or a score on levels you define. Apps use these to sort content, route requests and decide what to handle first. OpenAI says it is about 10 times faster than its Responses API. It entered beta on 6 October 2026 and became generally available on 22 October, with GPT-6 Luna as its only model.
A quick example
OpenAI's guide shows one request that looks at a product photo, checks it for damage and picks the product's category at the same time. The app then acts on those two answers itself.
Where you'll meet it
- Sorting support messages and other content into categories.
- Routing requests to the right team or tool.
- Ranking work by how urgent or severe it is.
Related
Sources
Checked by WhatIsAI against the sources above · 26 Oct 2026. Spotted an error? Report it.