Jev
Official TypeSafe documentation for Jev and the /v1/systemone API: Noul, Choice and Score questions over a state in one request.
This summary is based on how curated lists describe the project; its README was not available to review.
Overview
This entry is TypeSafe AI's official documentation for Jev, its first System One model and the origin of the /v1/systemone API. Jev takes a text state and Noul, Choice and Score questions in one request and returns typed answers with probabilities. The docs cover concepts, the three question primitives, patterns and the API reference.
Keys are issued from the TypeSafe console, and list summaries note that Jev is also served through Vercel AI Gateway, Cloudflare Workers AI and OpenRouter. This is the reference most community projects in this directory build on.
What the decision model decides
| Type | Question | Answers |
|---|---|---|
| Yes / no | Is this statement true of the state? | — |
| Choice | Which of these named options fits the state? | — |
| Score | Where does the state fall on this ordered rubric? | — |
How it works
- Get an API key from the TypeSafe console
- Send a state plus typed questions to /v1/systemone
- Receive probabilities for each allowed answer
- Branch in code on the answers
Strengths
- Authoritative description of the API and primitives
- Available through several providers
Caveats
- Hosted, paid service requiring a key
- Model internals are not documented publicly according to community sources
Getting started
Start at https://docs.typesafe.ai/introduction and create a key in the TypeSafe console.At a glance
- Type
- Service
- Status
- production
- Runtime
- Hosted API
Use cases and integrations
How curated lists describe it
TypeSafe AI's first System One model and the origin of the `/v1/systemone` API: Noul, Choice, and Score questions over a text state in one request. Keys from the [console](https://console.typesafe.ai/settings/keys); also served through Vercel AI Gateway, Cloudflare Workers AI, and OpenRouter.
AnotiaWang/awesome-decision-modelsConcepts, the three question primitives, patterns, and API reference.
MrJev/awesome-jev
Frequently asked questions
What is Jev?
TypeSafe's System One decision model, which answers typed questions with probabilities instead of generating text.
Where else can I call it?
List sources mention Vercel AI Gateway, Cloudflare Workers AI and OpenRouter.
Do I need a key?
Yes, from the TypeSafe console or a supported provider.
Related projects
Server behind api.typesafe.pro, a free anonymous System One-compatible endpoint that forwards to TypeSafe on the operator's key.
ServiceproductionBrowser form for building Jev requests from pasted text without hand-writing JSON, then rerunning to see how steady the answers are.
ProjectbetaJavaScriptTerminal REPL for shaping System One requests before writing code, with lessons, a sketch editor, conversation turns and offline simulation.
ServicebetaTypeScriptNushell module for TypeSafe's System One API: pipe content in, ask noul, choice and score questions, and filter on the numbers.
ServicebetaNushellOne-page playground and test bench for Jev with TypeSafe, OpenRouter, LLM-baseline and mock backends behind one /v1/systemone contract.
ServiceprototypeTypeScriptStatic browser interface for making structured Jev decisions through the Pollinations API, with multilingual READMEs.
ServiceprototypeJavaScript