My name is Jev.
(Yapping starts. You can safely skip this part if you just wanna know what Jev does)
If you have opened social media these days, you will see a word that keeps popping up - Jev.
Thinking it was another fad, I had no intention of learning how it works…
Until I saw a YouTube channel that I watch regularly cover it.
I said, “Screw it, it’s just 10 minutes. What can I lose?”
The video actually made me interested in trying Jev.
And I did. It’s easy to use, and I can see some use cases for it.
That’s why I want to summarize what I learned and give you a quick walkthrough of what Jev is without the hype.
Jev is not a LLM.
It's more like a classifier (the exact training method is unknown).
What the heck is a classifier?
Given a photo,

How likely is this a cat girl?
A classifier is an algorithm that makes that judgment.
It will give you a probability from 0 - 1 (0 being zero chance and 1 being 100%)

How's Jev different from other existing classifiers?
While other classifiers are designed to evaluate a specific thing, Jev lets you choose what you want to evaluate.
Meaning, you can define your
state (the picture)
question (how likely is this a cat girl)

Let's run through an example.
You are triggered by social media posts more than you want. So you decided to create a filter to not show posts that are ragebait.

To use Jev, you define two main components:
State
The input data you want Jev to evaluate (right now it can only be text)
In our case, it's the post's text:

Question
This is what you want Jev to evaluate.
In our case, it's the question:
"Is this ragebait?"
Notice how the answer is either Yes/No.
This is called a Noul question.
Turning everything into code:
const post = "Claude or Codex have never suggested Java as a backend.\nI wonder why.";
const response = await client.systemOne({
state: {
post,
},
questions: {
isRagebait: noul("Is this ragebait?"),
},
});
const score = response.answers.isRagebait.noul;
console.log(score);
// Example 0.58 (probably ragebait)
Noul questions return an output value from 0 - 1.
There are two more question formats:
Choice (A,B,C,D)
Score (0-N)
This is essentially how Jev works.
To sum it up, Jev is (likely) a generalized classifier that produces a faster and more reliable output than LLMs.
- Fee from Anime Coders

