HEAD TO HEAD

d1 vs solar-decide

Liquid AI: d1 and Upstage: solar-decide, compared on what they decide, where they run, what they cost and what their publishers report.

The short version

Both are only available as a hosted API.
Both answer choice, score, noul, classify and route questions.

Property	liquid-ai/d1	upstage/solar-decide
Summary	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.	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	d1	solar
Fine-tuned from	—	—
License	proprietary	proprietary
Availability	Hosted API	Hosted API
Hosted by	Liquid AI	Upstage
Input price	—	$0.10/MTok
Decision accuracy	—	—
Calibration error	—	—
Valid action rate	—	—
Median latency	—	—
p95 latency	—	—
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 d1 and solar-decide?

d1 is from Liquid AI and solar-decide from Upstage. Both are only available as a hosted API. Both answer choice, score, noul, classify and route questions.

Which is more accurate, d1 or solar-decide?

Neither publishes an accuracy figure. Test both on your own labelled examples.

Which is cheaper, d1 or solar-decide?

d1: Hosted, price not published. solar-decide: $0.1 / $0 per 1M. Open weights cost nothing per call beyond your own hardware.

Can I run d1 or solar-decide locally?

Neither: both are only served as hosted APIs.