Jev Guides
Understand the model, then put it to work.
What Is Jev? TypeSafe's System One Model
→A practical explanation of Jev, how System One differs from a language model, and when typed probabilistic decisions are useful.
Jev Playground: How to Test Your First Decision
→A practical walkthrough for testing Jev in the TypeSafe console, designing a useful first question, and evaluating the result before writing production code.
What Is Noul in Jev? A Practical Guide
→Learn how Jev's Noul primitive returns a yes probability, when to use it instead of Choice or Score, and how to turn uncertainty into safe code.
Jev API Access: TypeSafe, OpenRouter, and Vercel
→Compare the verified ways to access Jev, including the native TypeSafe API, OpenRouter, and Vercel AI Gateway.
Jev Alternatives: Rules, Classifiers, and LLMs
→Compare Jev with deterministic rules, trained classifiers, GLiNER, and general language models for routing, scoring, extraction, and typed decisions.
Jev Pricing: What the Published Numbers Mean
→Understand Jev's published input pricing, free output, provider differences, and the costs a token price does not capture.
Jev Use Cases: Where Typed Decisions Fit
→Practical Jev use cases for routing, scoring, verification, guardrails, and high-volume classification.
Jev vs. LLMs: Typed Decisions vs. Generated Text
→Compare Jev's typed probabilistic decisions with the free-form generation of GPT, Claude, and other language models.
Jev Quickstart: Your First Typed Decision
→Learn the shape of a Jev request, choose an SDK or provider, and build a safe first decision workflow.
About Jev Evidence and Editorial Policy
→How About Jev verifies sources, labels vendor claims, and separates official facts from community findings.