Liquid AI's first decision model, served only through the Liquid API. Returns Choice, Score and Noul answers with probability distributions and zero output tokens, on the /v1/systemone request shape used by TypeSafe's SDK.
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.
Decides
choice, score, noul, classify, route
choice, score, noul, classify, route
Architecture
d1
decision
Fine-tuned from
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qwen/qwen3.5-9b
License
proprietary
apache-2.0
Availability
Hosted API
Open weights
Hosted by
Liquid AI
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Input price
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Decision accuracy
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77.4%
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 d1 and decision?
d1 is from Liquid AI and decision from vLLM Semantic Router. d1 is only available as a hosted API; decision has open weights you can download and run. Both answer choice, score, noul, classify and route questions. d1 is licensed proprietary; decision, apache-2.0.
Which is more accurate, d1 or decision?
Only decision publishes an accuracy figure (77.4% on vLLM-SR decision benchmark (54 tasks, 3,766 decisions, weighted)); d1 does not, so there is no comparison to make without your own test.
Which is cheaper, d1 or decision?
d1: Hosted, price not published. decision: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Can I run d1 or decision locally?
decision yes — systemone pull vllm-semantic-router/decision downloads its weights. The other is only served as a hosted API.
