An open family of System One models. A LoRA adapter plus a pointer head on a frozen Qwen base returns a distribution per typed question in one forward pass, serves TypeSafe's /v1/systemone contract, and ships a fitted temperature with every checkpoint.
One of the earliest Jev-shaped scorers. A sequence-classification head on Qwen3.5-4B-Base scores each (state, question, option) triple and softmaxes per question. Non-commercial licence.
Decides
choice, score, noul, classify, route
choice, score, noul, classify
Architecture
kev
scorer
Fine-tuned from
qwen/qwen3.5-4b-base
qwen/qwen3.5-4b-base
License
apache-2.0
cc-by-nc-4.0
Availability
Open weights
Open weights
Hosted by
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Input price
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Decision accuracy
83.8%
70.7%
Calibration error
0.042
0.044
Valid action rate
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Median latency
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112 ms
p95 latency
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Evaluation suite
transfer-v4 (locked, out of domain)
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 kev and system-one-qwen3-5-4b-scorer?
kev is from Jared Palmer and system-one-qwen3-5-4b-scorer from pngwn. Both have open weights you can download and run. Both answer choice, score, noul and classify questions. Only kev answers route. kev is licensed apache-2.0; system-one-qwen3-5-4b-scorer, cc-by-nc-4.0.
Which is more accurate, kev or system-one-qwen3-5-4b-scorer?
They report on different suites — kev 83.8% on transfer-v4 (locked, out of domain), system-one-qwen3-5-4b-scorer 70.7% on author-reported — so the numbers do not rank them. Test both on your own labelled examples.
Which is cheaper, kev or system-one-qwen3-5-4b-scorer?
kev: Free (open weights). system-one-qwen3-5-4b-scorer: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Can I run kev or system-one-qwen3-5-4b-scorer locally?
Yes, both: systemone pull jared-palmer/kev and systemone pull pngwn/system-one-qwen3-5-4b-scorer download the weights.
