MEET THE MODEL

A little less chat.
A little more choice.

Jev is TypeSafe AI's first System One model. You give it context and focused questions. It gives your software structured answers to work with.

THE BASIC IDEA

State. Question.
Decision. Action.

Most of the application stays ordinary software. Jev contributes judgment at the points where rigid rules become awkward.

01 / STATE

A support message, the current page, a document, or a structured record.

02 / QUESTION

Define one focused judgment and the shape of the answer you need.

03 / DECISION

A choice, a score, or a yes/no probability. Inspect uncertainty before acting.

04 / CODE

Route, rank, filter, ask for review, or hand the task to another model.

A USEFUL FIT

Classifying a ticket. Choosing a tool. Scoring relevance. Deciding which document needs a closer look.

KEEP OTHER TOOLS IN THE LOOP

Use generative models for new text. Use code for exact calculations and permissions. Evaluate complex reasoning separately.

START WITH THE PRIMARY SOURCE

This is an independent explanation. See TypeSafe's official introduction, model specifications, and known limitations. Reviewed September 21, 2026.