AI tool guides
Independent, plain-English guides to new AI models and developer tools. Each guide opens with a short direct answer under every question, then the detail, and ends with the official sources we checked and the date.
Short answer: There are three guides today, all about Jev, the System One decision model from TypeSafe AI: a quickstart, a comparison of the four ways to get API access, and when to use Jev instead of an LLM. More tools will be added here as we cover them.
Jev (TypeSafe AI)
Jev API quickstart: your first call with curl, Python and TypeScript
Jev is called with POST https://api.typesafe.ai/v1/systemone: you send some text (the state) plus typed questions and get typed answers with probabilities back. The guide covers a first curl call, the official SDKs, limits and error codes.
How to get a Jev API key: four ways compared
There are four documented routes: TypeSafe direct, OpenRouter, Vercel AI Gateway and Cloudflare Workers AI. Only the first gives you a TypeSafe key; the others use the platform's own key and billing.
Jev vs LLM: when to use a decision model and when to use a text model
Use Jev when the answer is one of a known set (route, classify, score or flag) and an LLM when you need generated text. The guide covers when Jev is the wrong tool and how to combine both.
Can I request a guide for another AI tool?
Yes. Tell us which tool through the contact page. We are not affiliated with TypeSafe AI or any vendor we cover; see the disclosure.