Guides
Guides
Core concepts: what Jev is, how to get access, and how it compares to LLMs.
Jev Alternatives: Structured Outputs, Fine-Tuned Classifiers, and Rules
An honest comparison of Jev against LLM structured outputs (JSON mode), fine-tuned BERT-class classifiers, and rules engines — including the cases where you should not use Jev at all.
Getting Started with Jev: API Key, First Call & SDKs
How to get a Jev API key from console.typesafe.ai, call the System One endpoint with curl, and install the official Python or TypeScript SDK. Verified request structure inside.
Jev vs LLM: When to Use Which (and Why Together Is Cheapest)
Jev is judgment-only; LLMs are generative. A practical decision framework: when Jev wins, when an LLM wins, and why a Jev-front-filter pipeline can be orders of magnitude cheaper.
What Is Jev? The Judgment-Only AI Paradigm Explained
Jev is a System One model from TypeSafe AI: it never writes text — it returns yes/no answers, choices, and scores. Founder, naming, training method, and why it pairs with LLMs.