OpenAI Makes Decisions API Generally Available with GPT-6 Luna

OpenAI made its Decisions API generally available on October 22, 2026, the company announced, taking the GPT-6 Luna –powered endpoint out of public beta at a price of $0.10 per million input tokens. The API returns bounded, typed answers (a probability, a selection, or a rubric score) that applications use to classify content, route requests, and prioritize work. OpenAI said the API focuses Luna’s intelligence on questions with bounded answers, enabling near real-time decisions from text, images, and structured inputs. The company said the endpoint delivers those answers up to 10x faster than asking GPT-6 Luna through the Responses API. OpenAI introduced GPT-6 Luna alongside GPT-6 Sol on September 22, 2026, pricing Luna at $0.10 per million input tokens and $0.50 per million output tokens.