OpenAI made the Decisions API generally available on October 22. It runs on GPT-6 Luna, the only supported model, through a dedicated endpoint. A request supplies text, images or JSON plus up to 400 questions, double the beta limit. Each question returns one of three answer types: the probability that a condition is true, a choice from supplied options with probabilities and a confidence value, or a score that averages ordered rubric levels by probability. OpenAI's developer guide points to the Responses API when a written explanation is needed. Uncached input costs $0.10 per million tokens and cached input $0.01. OpenAI charges nothing for output tokens. The guide says regional processing premiums and long-context multipliers apply. OpenAI says the API is up to 10 times faster than GPT-6 Luna through the Responses API. That is OpenAI's claim, and the announcement publishes no workload, accuracy result or Responses API price to check it against. Since the beta, OpenAI added prompt caching, inference residency in the US and EU, native JSON input, images in question instructions and a GPT-Live integration. Zero Data Retention and HIPAA use are available to eligible customers. This is a price for bounded questions: routing a support ticket, tagging a document, or deciding whether an agent should retry. With no output charge, a classification job costs roughly in proportion to what you send, and one shared document can be asked many questions in a single request. The number to test is accuracy. OpenAI publishes none, and a probability of 0.9 is only useful if it holds on your own labeled examples. The developer guide says to set thresholds from them. Check the regional-processing premium before comparing the price with your current bill. Test Decisions on 50 labeled examples from one routing task before comparing cost. OpenAI's announcement has an interactive demo and an answer-type table but no benchmark, accuracy result or pricing comparison, and no Responses API baseline price. No relevant visual evidence could be verified. Decisions API developer guide: Request format, the three question types, the 1,024-token caching threshold, the pricing and availability section with regional premiums, and the advice to set thresholds from labeled examples.