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system-one-router

mmornati/system-one-router · Homepage

Fast System One model picks the right LLM per prompt.

Automated README summary

Automatically summarized from the README on 11 Oct 2026; not a run by jevbooks. Run instructions and author-reported outcomes still need verification.

What it is

An OpenAI- and Anthropic-compatible Go gateway that routes each prompt to the cheapest sufficient LLM, using a small System One decision model (Jev or local Laya).

How it uses Jev

Jev answers four typed questions about the prompt in one call: topic, complexity, risk, private data. Plain arithmetic over config.yaml then picks the cheapest model that clears the quality floor.

Primitives:choicescore

Technique worth stealing

Use a tiny System One model for typed decisions, then plain arithmetic to pick the cheapest sufficient System Two LLM.

Try it

cp .env.example .env; go run ./cmd/gateway; curl localhost:8787/v1/chat/completions with model "auto"

View on GitHub

Start using Jev: API key and your first request →

Model judgments from README excerpts

Project signals use repository metadata, an existing summary and the first 700 README characters, not the full project. “Not found” means not detected in that material; it does not establish absence. These are the original judgments with recorded models and dates, not source audits or run results.

Models & evaluation dates

Inclusion gate
jev-1.13.0
Project signals
jev-1.13.0
Category
jev-1.13.0
Pattern tags
jev-1.13.0

Evidence

These signals use repository metadata, an existing summary and at most 700 cleaned README characters. ≥ 0.60 means reported in that excerpt; ≤ 0.40 means not found there. The middle band is inconclusive. None is a source-code audit or a test result. The runnable-tool question excludes research experiments; the recommendation question asks for a learning shortlist, not a quality verdict.

  • Jev is core to the projectunclear0.48
  • Shows a System One patternunclear0.45
  • Describes handling uncertaintynot found in the excerpt0.09
  • Reports measured numbersnot found in the excerpt0.14
  • Is a runnable toolFound in material0.93
  • Top-10 learning shortlist signalnot found in the excerpt0.37
  • Is a replica of the modelnot found in the excerpt0.22
  • Solves a common problem (0–2)score on a 0–2 scale1.78 / 2
  • About JevFound in material0.96
Signals
Jev is core to the project0.48Shows a System One pattern0.45Describes handling uncertainty0.09Reports measured numbers0.14Is a runnable tool0.93Top-10 learning shortlist signal0.37Is a replica of the model0.2200.51Solves a common problem (0–2)1.78 / 2012

no-judgment band (0.40–0.60)

Design patterns
Funnel0.95Questionnaire0.93Flight recorder0.85Check-up0.65Blind review0.47Ghostwriter0.22Scorecard0.2000.51

no-judgment band (0.40–0.60)

The Jev model and date for each judgment stage are listed above. Card written by DeepSeek V4.1 Flash from the README on 11 Oct 2026.