Sign up for Jev
Signing up for Jev takes about a minute: create an account, generate a jv_live_ key, and make your first typed decision. You can try it free in the browser before you sign up at all.
Jev is TypeSafe AI's first System One model — launched in September 2026 by Diogo Almeida, the OpenAI researcher who co-invented RLHF and InstructGPT. A call returns one of your options, calibrated probabilities, and a confidence score in roughly 70–500ms. Sign-up is self-serve: no sales call, no waitlist, no approval step.
How to sign up
- Try it free first: run a decision in the browser playground, no account needed
- Create your account on the get-access page
- Generate a jv_live_ key in the dashboard
- Make your first call to /api/v1/decide
What you get
Your key works against the hosted endpoint POST https://jevtypesafeai.com/api/v1/decide (official upstream POST https://api.typesafe.ai/v1/systemone). Every answer is a typed structured value with a calibrated confidence, produced in a single non-autoregressive pass — so there's no parsing, no invalid output, and nothing to repair. Usage, receipts and invoices are all self-serve in the dashboard.
Why sign up rather than self-host
There is an open-source System One model (Laya) you can run yourself, but out of the box it scores near random and needs fine-tuning plus your own hosting before it is useful. Jev is the hosted route: a calibrated model that works the moment you have a key, with no infrastructure to run. See the pricing page for current tiers.
FAQ
Do I need to talk to sales?
No. Sign-up is fully self-serve — create an account, generate a jv_live_ key in the dashboard, and start calling the API. There's no waitlist or approval step.
Can I try Jev before signing up?
Yes. The browser playground runs real decisions with no account, so you can evaluate Jev first and only sign up when you're ready to call it from your own code.
What can I do right after signing up?
Generate a jv_live_ key and POST to /api/v1/decide. Your first typed, calibrated decision is one request away, and usage and invoices are visible in the dashboard.
See also: Get access · Pricing · API keys · How to use the API
Sign up for Jev
Try it free in the browser, then grab a jv_live_ key — instant and self-serve.