OpenAI Decisions API enters public beta with GPT‑6 Luna

What is changing?

OpenAI has moved the Decisions API into public beta. The dedicated endpoint, which currently works only with GPT‑6 Luna, evaluates text, images, or both and returns three types of structured results: the probability that a condition is true, one option from a predefined set, or a score against an ordered rubric. This lets applications classify content, route requests, and select an agent’s next action without generating free-form text.

OpenAI says the API is roughly 10 times faster than the Responses API; that is a product claim, and real latency should be measured in each application. GPT‑6 Luna costs $0.10 per million input tokens on this endpoint, with no output-token charge. General availability is expected in the coming weeks.

For production teams, the clearest uses are automatically tagging visual and text assets, prioritizing quality-control requests, and separating work that requires human approval. OpenAI also recommends calibrating thresholds with labeled examples and choosing them according to the cost of false positives and false negatives.