# Jev Model Guide

> Independent developer notes for TypeSafe AI’s Jev System One model. Not affiliated with TypeSafe.

Jev is a hosted decision model. It returns a typed choice, score, or yes/no probability. It does not generate text.

## Core

- [What is Jev AI?](https://jevmodel.org/what-is-jev): TypeSafe System One model, current version jev-1.13.0
- [Is Jev open source?](https://jevmodel.org/is-jev-open-source): hosted API, no public weights
- [How to use Jev](https://jevmodel.org/how-to-use-jev): endpoint, SDK, request shape
- [Get Jev access](https://jevmodel.org/get-jev): TypeSafe console and Vercel AI Gateway
- [Jev API examples](https://jevmodel.org/api): choice, score, noul
- [Jev pricing](https://jevmodel.org/jev-pricing): $0.042 / 1M input tokens, output free

## Compare

- [Jev vs GPT](https://jevmodel.org/jev-vs-gpt)
- [Jev vs Claude](https://jevmodel.org/jev-vs-claude)

## Use cases

- [Jev for AI model routing](https://jevmodel.org/use-cases/ai-routing)
- [Jev for tool-call guardrails](https://jevmodel.org/use-cases/tool-call-guardrails)
- [Jev for support triage](https://jevmodel.org/use-cases/support-triage)
- [Jev for context compaction](https://jevmodel.org/use-cases/context-compaction)

Official site: https://typesafe.ai
Official API: POST https://api.typesafe.ai/v1/systemone