OpenAI releases the Decisions API in beta, built on GPT-6 Luna

OpenAI

OpenAI released the Decisions API in beta on October 6, 2026, running on its GPT-6 Luna model. It takes text and images as input and returns typed answers, meaning structured results that software can use directly. OpenAI says it is 10 times faster than the Responses API; the changelog gives no benchmark for that figure.

• Input is text and images; output is a typed answer rather than free-form text, so code can read the result without parsing prose.
• It is in beta, so behaviour, limits and pricing may still change.
• The 10x speed claim is stated against OpenAI's Responses API and has no published benchmark in the changelog.
• The same day, OpenAI cut its API usage tiers from five to three (Build, Launch and Grow); organizations move up automatically once credit purchases reach each tier's minimum.