What it is
jeff is a self-hosted drop-in replacement for TypeSafe's jev System One API, powered by GLiFormer 400M. It serves Choice, Score, and Noul questions via a compatible HTTP API, letting users run the official typesafe-sdk against their own deployment.
How it uses Jev
jeff implements the Jev System One API: it receives a state and typed questions (Choice, Score, Noul) and returns calibrated probabilities. The server uses GLiFormer to compute these probabilities, and the official SDK can be pointed at jeff via TYPESAFE_BASE_URL.
Primitives:choicescorenoul
Technique worth stealing
Temperature-scaled normalized sigmoids for probability calibration.
Try it
uv sync --extra dev; uv run hf download knowledgator/gliformer-large-v1 --local-dir models/gliformer-large-v1; JEFF_API_KEYS=devkey uv run jeff
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-centricyes0.92
- Shows a System One patternno0.07
- Handles uncertaintyno0.04
- Measuredno0.14
- Runnableyes0.96
- Worth recommendingno0.22
- Model replicayes0.96
- Problem scopescore on a 0–2 scale1.08
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 21 Sept 2026.