OpenAI makes its Decisions API generally available at $0.10 per million input tokens

OpenAI has opened its Decisions API to everyone with API access. General availability arrived on October 22, 2026, with pricing set at $0.10 per million input tokens. Output costs nothing. Neither do cache reads or cache writes. What the Decisions API actually does The Decisions API is designed for high-volume, low-latency decision-making. Instead of returning paragraphs, it produces structured, typed answers in the form of probabilities, choices, and scores. The endpoint runs on OpenAI’s GPT-6 Luna model. It targets routing requests, classifying inputs, and repeated micro-decisions. One request can carry up to 400 questions. That ceiling was raised from what developers had during the beta period. Speed, features, and compliance The Decisions API is reported to run up to 10 times faster than using GPT-6 Luna through the standard Responses API for bounded decisions. In demonstrations, latency came in at approximately 150 milliseconds. OpenAI also shipped several upgrades between beta and general availability. These include native GPT-Live integration, prompt caching, and support for image and JSON inputs. On the compliance side, the API supports Zero Data Retention and is HIPAA elig...