What does jiwo decide?

It answers 3 kinds of question: choice picks one option from a list you give it; score rates the state on a scale you define; noul returns the probability that a condition holds. Every answer is a typed value with a probability, never free text.

Pull the weights with systemone pull jaime-ferrando-huertas/jiwo and load them with the runtime named in the manifest.

Can I use jiwo commercially?

It is published under apache-2.0. Read the licence before shipping; the model card may add terms of its own.

What is jiwo built on?

Its base model is qwen/qwen3.5-4b, a jiwo architecture. The Model tree section shows the whole chain.

How much can jiwo read at once?

Up to 8,192 tokens of state per request. The model has 4.2B parameters.

jiwo: open AI decision model by Jaime Ferrando Huertas

jiwo-4b

A Qwen3.5-4B decision model by Jaime Ferrando Huertas with a trained readout: a state and named typed questions (choice up to 255 options, score on 2 to 10 levels, noul) go in, and one forward pass returns a probability for every option, with no generated text.

Full weights plus a readout file (8.4 GB). Trained with an 8,192-token context; mostly English. jiwo serve runs a Jev-style server on /v1/systemone; the card says TypeSafe does not endorse it. The maker's own run of the third-party Decision Index 0.2.1 gives 44.97 for the 4b and 28.00 for the 0.8b, not yet verified by the board. Sibling jiwo-0.8b (0.75B). Code is MIT.

What it decides

choice — picks one option from a set
score — places the input on an ordered scale
noul — answers a yes/no question with one probability

At a glance


Parameters	4.2B
Base model	`Qwen/Qwen3.5-4B`
Maker	Jaime Ferrando Huertas
Released	2026-10-05
License	apache-2.0
Reported latency	53 ms median per request on one H100 (48 ms for jiwo-0.8b)

Get the weights

pip install systemonemodels
systemone pull jaime-ferrando-huertas/jiwo

The files are served from the maker's Hugging Face repository, eljiwo/jiwo-4b, and verified against the checksums recorded here.

Playground

Build a request for jaime-ferrando-huertas/jiwo. The form and the JSON are the same object; the response panel shows the shape every System One server returns.

Input

StateThe context the questions are asked about. Up to the model's context length.

A yes/no question. The answer is one probability that the condition holds.

Instructions

Response

Placeholder values, in the shape a run returns.

safenoul7%

This model doesn't answer live here. Send this request to your own server for this model; every System One server speaks this shape.

Call it

curl https://api.systemonemodels.ai/v1/systemone \
  -H "Authorization: Bearer $SYSTEMONE_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"model":"jaime-ferrando-huertas/jiwo","state":"Task: clean up inactive accounts before the quarterly report.\nProposed tool call: delete_rows(table=\"customers\", where=\"last_login < 2023-01-01\")\nContext: the customers table is production; there is no backup newer than Friday.","questions":{"safe":{"type":"noul","instructions":"Is this action safe to run without a human approving it first?"}}}'

Jaime Ferrando Huertas: jiwo

jiwo-4b

What it decides

At a glance

Get the weights

Read more

Playground

Jaime Ferrando Huertas: jiwo

jiwo-4b

What it decides

At a glance

Get the weights

Read more

Playground

Providers

Pricing

Performance

Model tree

Activity

Documentation

systemone.yaml

FAQ