Primitives

Introduction, primitives, patterns, cookbooks, HTTP API, and SDK references.

Paste a state, add questions, and see typed answers in the browser.

Reproducible recipes: parallel questions, reranking, guardrails, citation checks, extraction, hierarchical classification.

A curated list of Jev use cases, projects, SDKs, and resources. Jev is TypeSafe AI's System One model for fast, typed decisions in software — Choice, Score, and Noul with calibrated probabilities.

Japanese walkthrough of what Jev is and is not.

One direct Jev question per row against 12–14 Jev-scored dimensions with locally fitted weights on three classification tasks: 5,477 test rows, 25,174 Jev calls, $1.43. Decomposition wins on Japanese NLI (0.9076 vs 0.8373) but flags about 25× more hard benign rows as attacks (37.2% vs 1.5%).

Third-party write-up of the System One primitives, pricing, and vendor workflow evals.

Selective list behind a 10-star bar, with hands-on reviews at mrjev.com recording what each tool sends and where.

The most complete gallery of what people build with Jev, TypeSafe's System One model: 3,400+ projects, demos, and write-ups by scenario, each with its original link, image, and description.