Try Jev AI for free.
Run real Jev decisions in your browser.
No signup. No API key. Just answers.
A little context.
A clear decision.
Give Jev a state and a question.
Your decision, probabilities, and insights
will appear right here.
Take the pattern to
your next build.
Inspect the request shape.
Build with Jev through its official docs.
{
"playground": "https://aijev.net",
"language": "JavaScript",
"request": {
"model": "typesafe/jev-1.13",
"state": "Customer says: \"I was charged twice for my subscription and need a refund.\"",
"questions": {
"decision": {
"type": "choice",
"instructions": "Which team should handle this request?",
"criteria": {
"Billing": "Billing",
"Technical Support": "Technical Support",
"Sales": "Sales",
"Other": "Other"
}
}
},
"provider": {
"allow_fallbacks": false
}
},
"note": "AIJev Playground request shape only. For application integration, visit https://docs.typesafe.ai."
}Jev doesn’t write.
It decides.
Some tasks don’t need a paragraph. They need a choice.
Jev turns your context into structured decisions your
software can actually use.
Choose a direction.
Route a ticket. Pick a tool. Classify an intent.
One choice from the options you define.
Find the degree.
Evaluate relevance, quality, or sentiment.
A nuanced score, grounded in your rubric.
Make the call.
Check a condition. Validate a response.
A yes or no, with the probability behind it.
Illustrative outputs. Real results depend on your input.
The right model for the right job.
Use Jev for focused decisions. Use an LLM for generation and reasoning.
Good questions.
Clear answers.
New to System One models?
You’re in the right place.
Is this really free?+
The playground provides up to 100 decisions per visitor each day, subject to shared capacity. The allowance resets at midnight UTC. No account or personal API key is needed.
What is Jev, exactly?+
Jev is TypeSafe’s System One model for structured decisions. It evaluates text context and returns a Choice, a continuous Score, or a Noul probability rather than writing a response.
Are these real model results?+
Yes. Every successful run uses the real Jev model. If the service is not configured or is unavailable, we show an error instead of a simulated result.
Can I use this in my own app?+
The code panel shows the Playground request shape. For production integration, use the official Jev documentation. This playground is not a public API proxy.
Can I trust every decision?+
No model is always right. Calibrated probabilities describe behavior across predictions, not a guarantee for one answer. Use validation and human review for consequential actions.
Independent by design. Powered by real models.
Built on TypeSafe Jev. Learn about AIJev ↗