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.
StartLux's decision family in five sizes, 0.8B to 27B. All questions in a request are answered in one forward pass, with a probability for every option, through a TypeSafe /v1/systemone-compatible server that records CUDA graphs for short requests.
Decides
choice, score, noul, classify, route
choice, score, noul
Architecture
decision
startlux-decision
Fine-tuned from
qwen/qwen3.5-9b
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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%
88.3%
Calibration error
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Valid action rate
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Median latency
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26 ms
p95 latency
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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 startlux-decision?
decision is from vLLM Semantic Router and startlux-decision from StartLux. Both have open weights you can download and run. Both answer choice, score and noul questions. Only decision answers classify and route. startlux-decision is the smaller model, at 4.7B parameters to 9.0B. decision is licensed apache-2.0; startlux-decision, cc-by-nc-4.0.
Which is more accurate, decision or startlux-decision?
They report on different suites — decision 77.4% on vLLM-SR decision benchmark (54 tasks, 3,766 decisions, weighted), startlux-decision 88.3% on JevBench public set (231 items; 204 correct), maker's run — so the numbers do not rank them. Test both on your own labelled examples.
Which is cheaper, decision or startlux-decision?
decision: Free (open weights). startlux-decision: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Can I run decision or startlux-decision locally?
Yes, both: systemone pull vllm-semantic-router/decision and systemone pull startlux/startlux-decision download the weights.
