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OpenAI previews Decisions API for real-time app routing powered by GPT-6 Luna

September 29, 2026 at 14:39 EDT

Foundation Models
AI Agents
Software Dev & Coding

OpenAI has introduced a limited-preview Decisions API, a developer tool powered by GPT-6 Luna that lets applications define questions and possible answers for real-time choices such as content classification, request routing and agent action selection. The release points to a narrower, operational use of frontier models: instead of asking a model for open-ended prose, developers can ask it to choose among predefined outcomes inside an application flow.

Sep. 29, 2026 · OpenAI

Decisions API enters limited preview

OpenAI is testing a GPT-6 Luna-powered API for real-time app choices, from classification and request routing to selecting an agent's next action.

Availability

Limited preview

Context window

1,050,000

DeepSWE v1.1

66.6%

GPT-6 Luna token prices

$0.10

Input / 1M tokens

$0.50

Output / 1M tokens

Output tokens are priced at five times input tokens under standard short-context pricing.

How the decision layer works

Define

Question and allowed answers

→

Decide

GPT-6 Luna selects an option

→

Route

Classify, hand off or act

Why developers care

Low token pricing, structured choices and a large context window fit high-volume routing, classification and agent loops.

Open questions

The preview is constrained, the model is not fine-tunable, and detailed Decisions API latency and accuracy data has not been published.

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