OpenAI announced the public beta of the Decisions API using GPT-6-luna. It specializes in probabilities for propositions, selection among candidates and scoring, accepting text and inline images but not remote image URLs or file IDs. The company describes it as about ten times faster than the Responses API, although actual speed needs workload-specific testing. Arbitrary JSON generation and tool calls remain the domain of other APIs, and probabilities need calibration against business data. Simon Willison released an early llm-openai-decisions plugin that exposes the three judgment types through a terminal CLI.