OpenAI Decisions API is GA: classify, route and pick next actions with no output-token charge

The Decisions API (POST /v1/decisions) answers questions you define in a fixed format instead of writing free text. There are three question types: predicate returns the probability that something is true, choice picks one of your options, and score rates input on ordered levels. It runs on gpt-6-luna and takes text, images and JSON. With GA, the limit per request doubled to 400 questions, and OpenAI added prompt caching, a GPT-Live integration and US and EU processing regions.

curl https://api.openai.com/v1/decisions \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-6-luna", "input": "I was charged twice for my order.", "questions": [{"type": "choice", "name": "department", "instructions": "Which department should handle this complaint?", "choices": [{"value": "billing", "description": "Payments, invoices, and refunds."}, {"value": "technical", "description": "Problems using the product."}, {"value": "shipping", "description": "Delivery and tracking."}]}]}'

Agents make lots of small calls inside one task: which tool to use, where a ticket should go. Running those through a general response API adds latency and cost. OpenAI says Decisions is up to 10x faster than calling the same model through the Responses APIVendor claim. Uncached input costs $0.10 per million tokens and output tokens are free. If you have steps that only need a judgment, like ticket triage, content moderation or agent routing, it's worth pricing them out on this API.