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System One

wfzyx/von

Apache 2.0 decision model on a 395M ModernBERT encoder that serves the same /v1/systemone API as Jev, installed as von-sdk from pip or npm. Version 1.2 scores each option on its own, so reordering options no longer changes answers. Its own table puts Von 1.1 at 72.0% on the 49-task jabr v2 suite against 96.6% for Jev.

Von choosing movement and combat actions in Doom, 29 seconds of unedited gameplay
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wfzyx/von on GitHub

Stars
607
Forks
46
Language
Python
License
Apache-2.0
Last push
24 Sep 2026

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How it uses Jev

/**
 * Evaluates state and questions via System One wire protocol (POST /v1/systemone).
 */
async systemOne({
  state,
  questions,
  model = VON_MODEL,
}: {
  state: unknown;
  questions: Record<string, Question>;
  model?: string;
}): Promise<SystemOneResponse> {
  const url = `${this.baseURL}/v1/systemone`;
  const headers: Record<string, string> = {
    "Content-Type": "application/json",

View in js/src/client.ts

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