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Cloudflare clef vs Span-01 Lite

Cloudflare clef and Span-01 Lite have no measured difference in accuracy, calibration or cost in our data yet.

SpecCloudflare clefSpan-01 Lite
ProviderCloudflareRespan
Decision Index score53.1—
Calibration error (ECE)0.040—
Median latency (p50)102 ms—
Cost per 1,000 decisions—Free
Parameters28B—
Open weightsYesNo
Question typesChoice (one of N options), Score (ordered rubric), Yes / noYes / no
MechanismDecoder LM with a decision readoutHosted API
Licenseapache-2.0proprietary

FAQ

Is Cloudflare clef or Span-01 Lite more accurate?

At least one of the two has no Jev Decision Index score yet, so their accuracy cannot be compared here.

Which is better calibrated, Cloudflare clef or Span-01 Lite?

No calibration difference between Cloudflare clef and Span-01 Lite is recorded yet.

Is Cloudflare clef or Span-01 Lite cheaper per 1,000 decisions?

A hosted price is not recorded for both models; open-weight models cost the compute you run them on.

Cost per 1,000 decisions assumes 200 input tokens per decision. Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.