Invergent's decision model for text and images. A fine-tune of Gemma-4-26B-A4B (about 4B parameters active per token) that answers Choice, Noul and Score questions, with an optional thinking mode for harder questions.
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
rune
span
Fine-tuned from
google/gemma-4-26b-a4b-it
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License
apache-2.0
proprietary
Availability
Open weights + hosted API
Hosted API
Hosted by
Invergent
Respan
Input price
—
$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 rune and span-01?
rune is from Surogate (Invergent) and span-01 from Respan. rune has open weights and a hosted API; span-01 is only available as a hosted API. Both answer noul and classify questions. Only rune answers choice, score and route. rune is licensed apache-2.0; span-01, proprietary.
Which is more accurate, rune or span-01?
Neither publishes an accuracy figure. Test both on your own labelled examples.
Which is cheaper, rune or span-01?
rune: Hosted, price not published, or free to self-host. span-01: $0.02 / $0 per 1M. Open weights cost nothing per call beyond your own hardware.
Can I run rune or span-01 locally?
rune yes — systemone pull surogate/rune downloads its weights. The other is only served as a hosted API.
