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.
Upstage's structured decision model, a System One endpoint on Solar Mini 4. Returns a choice, a score or a yes/no answer with a probability read from the model, in one forward pass, on the same /v1/systemone schema as Jev.
Decides
choice, score, noul, classify, route
choice, score, noul, classify, route
Architecture
decision
solar
Fine-tuned from
qwen/qwen3.5-9b
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License
apache-2.0
proprietary
Availability
Open weights
Hosted API
Hosted by
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Upstage
Input price
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$0.10/MTok
Decision accuracy
77.4%
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Calibration error
—
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Valid action rate
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Median latency
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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 solar-decide?
decision is from vLLM Semantic Router and solar-decide from Upstage. decision has open weights you can download and run; solar-decide is only available as a hosted API. Both answer choice, score, noul, classify and route questions. solar-decide reads up to 512K tokens of state, against 16K tokens for decision. decision is licensed apache-2.0; solar-decide, proprietary.
Which is more accurate, decision or solar-decide?
Only decision publishes an accuracy figure (77.4% on vLLM-SR decision benchmark (54 tasks, 3,766 decisions, weighted)); solar-decide does not, so there is no comparison to make without your own test.
Which is cheaper, decision or solar-decide?
decision: Free (open weights). solar-decide: $0.1 / $0 per 1M. Open weights cost nothing per call beyond your own hardware.
Can I run decision or solar-decide locally?
decision yes — systemone pull vllm-semantic-router/decision downloads its weights. The other is only served as a hosted API.
