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.
Respan's behaviour-scoring model for evals, guardrails and monitoring. For each plain-language behaviour you define, it reads a conversation or agent trace and returns the probability the behaviour is present, absent or not observable, in one forward pass.
Decides
choice, score, noul, classify, route
noul, classify
Architecture
solar
span
Fine-tuned from
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License
proprietary
proprietary
Availability
Hosted API
Hosted API
Hosted by
Upstage
Respan
Input price
$0.10/MTok
$0.020/MTok
Decision accuracy
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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 solar-decide and span-01?
solar-decide is from Upstage and span-01 from Respan. Both are only available as a hosted API. Both answer noul and classify questions. Only solar-decide answers choice, score and route.
Which is more accurate, solar-decide or span-01?
Neither publishes an accuracy figure. Test both on your own labelled examples.
Which is cheaper, solar-decide or span-01?
solar-decide: $0.1 / $0 per 1M. span-01: $0.02 / $0 per 1M. Open weights cost nothing per call beyond your own hardware.
