By ChatGPT Deep Research
As of November 12, 2026, all three providers now expose APIs specifically designed for machine-consumable judgments rather than free-form generation. The common shape is: provide shared evidence, define one or more bounded questions, receive typed values plus probabilities and, for some question types, confidence. The important implementation differences are in their schemas, supported modalities, model/versioning strategy, question limits, failure modes, and SDK ergonomics. The sections below use only official TypeSafe, OpenAI, and Google documentation, beginning with the pages specified in the request. 1, 2, 3
A useful mental model is that a Decisions API is not a general-purpose chat endpoint with a JSON output constraint. It is an inference primitive where **your application owns the d