A short, friendly starting point for Jev, the AI model from TypeSafe AI that answers with typed, calibrated decisions instead of text — so software can act on the output directly.
▶️ Play with Jev right now, free, no waitlist: jevtypesafeai.com
Community-maintained, not affiliated with TypeSafe AI. Official site: typesafe.ai.
- Jev is not a chatbot. It's a System One model built to be called by other software.
- You send it context + questions; it returns a choice, a score, or a yes/no probability.
- It can't hallucinate a format — the answer type is fixed by your request.
- ~70–500 ms, $0.042 / M input tokens (output free), no type errors by construction.
What is Jev AI? TypeSafe AI's first System One model. It turns messy input into typed, calibrated decisions for automation. → full explainer
How is it different from ChatGPT / an LLM? LLMs write prose for humans. Jev returns structured values with probabilities for machines — faster, cheaper, and safe to branch on in code.
How do I use the Jev API?
One POST to /v1/systemone with a state and questions. → API guide with curl / Python / TS
How much does Jev cost? $0.042 per million input tokens, output free (~$0.0004 per decision). → pricing
Can I try Jev without the waitlist? Yes — the free playground runs real API calls in your browser.
Who makes Jev? TypeSafe AI, founded by ex-OpenAI researcher Diogo Almeida; launched September 2026 with $40M seed.
choice → pick one of up to 255 labelled options (+ probabilities) e.g. routing, classification
score → a position on a 2–10 level ordered scale e.g. risk, urgency, quality
noul → a calibrated yes/no as a probability 0.0–1.0 e.g. gates, filters, guardrails
▶️ Free playground: https://jevtypesafeai.com- 📖 What is Jev: https://jevtypesafeai.com/what-is-jev
- 🔌 API guide: https://jevtypesafeai.com/how-to-use
- 💵 Pricing: https://jevtypesafeai.com/pricing
MIT. "Jev", "System One" and "TypeSafe AI" are trademarks of their respective owners.