OpenAI opened its dedicated Decisions API in public beta on October 6, running only on GPT-6 Luna. The announcement on the OpenAI developer forum prices it at $0.10 per 1M input tokens with zero charges for output tokens or cache reads and writes. The endpoint hits POST /v1/decisions and returns typed answers: a 0-to-1 probability, a choice from fixed options with confidence scoring, or a score against ordered severity levels.

The pitch is speed: OpenAI says the endpoint produces answers about 10x faster than the Responses API. The beta ships with Zero Data Retention support, HIPAA eligibility and US/EU data residency, positioning it as a drop-in for moderation and gating flows that previously stitched together JSON-schema prompts on Chat Completions.

The Decisions API debuted as a limited preview at DevDay on September 29. General availability is expected in the coming weeks.