The flagship of the vLLM Semantic Router team's Decision 1.0 family. Qwen3.5-9B with a shared candidate head returns a probability for every supplied answer to choice, yes/no and score questions, over a 16,384-token input.
One of the earliest Jev-shaped scorers. A sequence-classification head on Qwen3.5-4B-Base scores each (state, question, option) triple and softmaxes per question. Non-commercial licence.
Decides
choice, score, noul, classify, route
choice, score, noul, classify
Architecture
decision
scorer
Fine-tuned from
qwen/qwen3.5-9b
qwen/qwen3.5-4b-base
License
apache-2.0
cc-by-nc-4.0
Availability
Open weights
Open weights
Hosted by
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Input price
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Decision accuracy
77.4%
70.7%
Calibration error
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0.044
Valid action rate
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Median latency
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112 ms
p95 latency
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Evaluation suite
Figures are from each model’s manifest; accuracy and latency are what the publishers report, on their own suites and hardware. Add a third model.
Questions
What is the difference between decision and system-one-qwen3-5-4b-scorer?
decision is from vLLM Semantic Router and system-one-qwen3-5-4b-scorer from pngwn. Both have open weights you can download and run. Both answer choice, score, noul and classify questions. Only decision answers route. system-one-qwen3-5-4b-scorer is the smaller model, at 4.0B parameters to 9.0B. decision is licensed apache-2.0; system-one-qwen3-5-4b-scorer, cc-by-nc-4.0.
Which is more accurate, decision or system-one-qwen3-5-4b-scorer?
They report on different suites — decision 77.4% on vLLM-SR decision benchmark (54 tasks, 3,766 decisions, weighted), system-one-qwen3-5-4b-scorer 70.7% on author-reported — so the numbers do not rank them. Test both on your own labelled examples.
Which is cheaper, decision or system-one-qwen3-5-4b-scorer?
decision: Free (open weights). system-one-qwen3-5-4b-scorer: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Can I run decision or system-one-qwen3-5-4b-scorer locally?
Yes, both: systemone pull vllm-semantic-router/decision and systemone pull pngwn/system-one-qwen3-5-4b-scorer download the weights.
