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Metask Jev

An open-weight Jev-class lab: a candidate-logit scorer that turns state plus a bounded rubric into calibrated probabilities per option in a single forward pass, with no generation and no parsing.

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Oct 2026

metask-ai/metask-jev

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Metask-Jev: calibrated typed-decision models (Jev-class). Single forward pass, candidate-logit readout. metask-jev-4b beats Bespoke Nimble-9B and Jev on JevBench.

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About this project

探索最优开放权重的 typed-decision(Jev-class)模型:给定 state + bounded rubric,单次前向输出每个选项的校准概率。无生成、无解析。. 参照:Bespoke Nimble-9B 74.8% / 63.5(第14名);Jev 1.13.0 76.0% / 75.3(第2名)。. 输入一段 state + schema(choice / boolean / rubric score),输出每个选项的校准概率。单次前向,24ms/决策(RTX 4090)。. models/ — 模型注册表 + 每模型的 model card / 评测结果. release/ — HF + ModelScope 双发流水线. 评测协议:JevBench v1.2(github.com/fstandhartinger/jevbench,MIT)+ 13 个人工标注公开子集(3,880 条,与 Bespoke Nimble 口径一致)。.

Quoted from the project's README. Read the full README.

Highlights

  • The 4B model reports 79.6% macro-average over 13 subsets and 80.1% on JevBench 231 at 4096 context.
  • Inference is a candidate-logit scorer with MPS and CUDA adaptation, about 24 ms per decision on an RTX 4090.
  • One command reproduces the demo: install inference/requirements.txt, then run demo.py with a choice, boolean or rubric schema.
  • The repo carries the model registry, model cards, evaluation results, recipe cards and the release pipeline.

Watch out

This is not TypeSafe's hosted Jev. It is an open-weight Jev-class model you host yourself, and the README does not claim API parity. The 0.8B variant is listed as unreleased and is much weaker on JevBench at 55.8%. The teacher distillation recipe behind the training data is internal documentation and is not published, so the recipe cards cannot reproduce the data pipeline end to end. The 4B weights are on Hugging Face with the ModelScope publication still pending. Code is Apache-2.0 while the weights inherit the Qwen3.5 base terms. Copy reviewed against the repository README on 2026-10-04, not from running it.

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From the Jev guides

Original write-ups on what this entry is for.

Most Jev accuracy problems are state problems. What belongs in a state, what is a pre-made judgment to leave out, and why naming the slice you ask about matters more than the wording.
Jev Practices & Patterns#state#design#primitives
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A Noul returns one number and no separate confidence. How to read the value, pin its boundary with criteria, split compound questions, and set a per-action threshold that matches the cost of being wrong.
Jev Practices & Patterns#noul#primitives#confidence
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A Score is a weighted position, not a ruler. Why the number can land between levels, why levels are judged separately, and how to combine several atomic scores in code instead of one crowded rubric.
Jev Practices & Patterns#score#primitives#scoring
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