What it is
Rizzo Flow is an open-source, local-first implementation of the Jev "System One" idea. It takes unstructured state and returns typed decisions with probabilities (yes/no, choice, score, number) instead of text, running on your own hardware with open weights.
How it uses Jev
Jev makes typed decisions from state plus questions. Rizzo Flow reads answer-token probabilities after a single forward pass, mapping each candidate answer to one uppercase letter and returning softmax probabilities as typed JSON. Code written against the TypeSafe API can point at localhost by changing one URL.
Primitives:choicescorenoul
Technique worth stealing
Read the logits of answer letters only, softmax them, and return typed probabilities without generating any tokens.
Try it
uv run rizzo serve, then POST /v1/systemone or use the playground at http://127.0.0.1:8017/playground
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricyes0.91
- Shows a System One patternno0.20
- Handles uncertaintyno0.06
- Measuredno0.06
- Runnableyes0.94
- Worth recommendingno0.24
- Model replicayes0.93
- Problem scopescore on a 0–2 scale1.35
- About Jevyes0.95
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 22 Sept 2026.