OpenAI adds a Decisions API testing interface to its developer platform
OpenAI added a testing interface for the Decisions API to its developer platform. Developers can now try three decision modes, Predicate, Choice, and Score. It runs on GPT-6 Luna in public beta, supports text and image input, and costs $0.10 per million input tokens with no output fees.
What happened
OpenAI added a Decisions API testing interface to its developer platform, first spotted by TestingCatalog on October 20, 2026. The interface lets developers experiment with the Decisions API's three decision modes without writing integration code first: Predicate estimates the probability that a condition is true, Choice picks an answer from a set of given options, and Score rates an input against rating criteria.
OpenAI's documentation shows the API is in public beta and accepts both text and image input. The listed uses are content classification, request routing, and task priority determination. For now the API supports only the gpt-6-luna model, priced at $0.10 per million input tokens with no output token fees.
Why it matters
The Decisions API is the newest member of the GPT-6 family launched at DevDay 2026: models that return decisions instead of prose. A testing interface lowers the barrier for developers to evaluate whether decision-style outputs fit their product, and the input-only pricing with zero output fees signals OpenAI wants experimentation to be cheap.
Verified 2026-10-20.
Sources
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