OpenAI opens Decisions API for faster constrained-answer apps

Build more responsive apps with the Decisions API

OpenAI has released the Decisions API, built on GPT-6 Luna. For decisions with a fixed set of answers, it runs up to 10x faster than using GPT-6 Luna through the Responses API.

Why it matters: OpenAI moves constrained classification and routing decisions into a dedicated API, cutting the latency and cost that pile up across high-frequency small decisions in app workflows.