At Dev Day on September 30, 2026, OpenAI introduced the Decisions API, a preview tool using a version of Luna that it says is 10 times faster than the Responses API and supports visual inputs. Reporting since has established that it is a smaller model without reasoning, built for parallel inference and weaker on long-horizon tasks, and that it was built on existing Luna weights rather than a newly trained model. It is now generally available at $0.10 per 1M input tokens with no output charges. What the speed, visual support and pricing mean in practice remains the open question.