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Overview

TypeSafe AI builds System One models: models that make fast, structured decisions inside software instead of generating text. Its first, Jev (jev-latest, released on September 15, 2026), takes a state, any text or JSON, and a set of named questions of three types: a choice picks one of the labels you define, a score rates the state against an ordered rubric, and a noul gives the probability that the answer is yes. It answers every question in one pass, with the probabilities behind each answer and a confidence for each choice and score, so software can act on the sure answers and send the unsure ones to a person.

Every decision is one call, POST /v1/systemone, with the key as a Bearer token. It is not a chat API: the body is the state, the model and the questions, and there is no prompt or temperature. Requests are billed by input tokens, and output tokens are free for now. The official SDKs are typesafe-sdk for Python and @typesafe-ai/sdk for JavaScript.