Awesome Jev / TypeSafe
One call, three typed answers. TypeSafe's documented support-ticket example shows the saved
jev-1.13.0response below. This is a published example, not a live model call. Application code still decides when to route or escalate.
| Input or answer | Documented value |
|---|---|
| State | Hi, I've been trying to connect my Stripe account for 3 days and the integration keeps failing. I'm losing sales. Please help ASAP. |
| Choice | technical · 0.85 selected probability |
| Score | 1 on a 0–2 frustration rubric (Frustrated but civil) |
| Noul | 1.0 urgency probability |
See Jev at work
Open a live build from a preview, or read its listing first.
Recently curated
Three additions from 22 September 2026. These are places to explore, not a ranking or endorsement; the full listings include limitations and source links.
- pg-jev — Jev judgments over PostgreSQL rows; inspect the data transfer and superuser requirements.
- Kev — Local Jev-style models with released weights and evaluation suites; compare on your own task.
- Jevals.com — Independent hosted-model benchmark with public suites and per-decision logs; read the harness limits.
| I want to… | Go here |
|---|---|
| Understand the idea in 2 minutes | See where Jev fits, try the policy threshold, then read the introduction and the three primitives |
| Make my first typed call | Copy the runnable example, shape your own question, then explore the official SDKs |
| See it work live | Explore the featured builds, then browse more applications |
| Test the claims | Read what independent tests found, inspect JevBench's cross-model results, then browse independent evaluations and TypeSafe's own evals |
Download the JSON directory · Use with a coding agent · Suggest a resource · Follow updates · Join the builder community
Independent community project. This repository is not affiliated with or endorsed by TypeSafe AI. Community entries are labeled by section; inclusion is not a claim that TypeSafe has reviewed or approved them.
Last updated: 2026-09-23. Links and project descriptions change; please report a stale entry.
Contents
- See Jev at work
- Recently curated
- Start here
- Official resources
- Community projects
- Contributing
- Contributors
Start here
- Introduction — What Jev is, how System One models differ from text-generation models, and the Choice, Score, and Noul primitives.
- Quick start — The shortest path from an API key to a typed decision in Python or JavaScript.
- How to build with TypeSafe — Design guidance for decomposing a workflow into narrow judgments while keeping policy and side effects in code.
- TypeSafe Console — Create keys and inspect live Jev requests.
Choose the right tool
In a support workflow, separate the work before choosing a model. This is a practical design rule based on the TypeSafe introduction linked above, not a performance claim:
| What the step needs | Use | Example |
|---|---|---|
| Apply an explicit rule to known fields | Code | Check an account flag or enforce a routing threshold. |
| Judge messy context with a bounded answer | Jev | Choose billing, technical, or other for a ticket, with probabilities. |
| Produce prose or work through an open-ended task | Text LLM | Draft the reply after the route is chosen. |
Code still validates the answer and owns the action. Measure Jev's error and abstention rates on your own cases before automating a consequential step.
One state can answer several focused questions in the same request. Pick the answer shape your code can use directly:
| Question shape | Use it for | What comes back |
|---|---|---|
| Noul | A clear yes/no claim, such as “Does this message request a refund?” | A number from 0 to 1: the probability of yes. |
| Choice | Selecting from named options, such as billing, technical, or sales. | The selected option, a probability for every option, and confidence. |
| Score | An ordered rubric, such as calm, concerned, or angry. | A position on your rubric, probabilities over its levels, and confidence. |
Ask independent questions together. Set thresholds, fallback behavior, and side effects in application code.
Choose where to call Jev
The typed decision is the common idea; th