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.
Metask Lab's calibrated decision model in 16 languages. Qwen3.5-4B with a merged LoRA trained with the Nimble candidate-logit objective; one forward pass and a softmax over at most 26 answer-letter logits, with one temperature per question type.
Decides
choice, score, noul, classify, route
choice, score, noul, classify, route
Architecture
kev
metask-jev
Fine-tuned from
qwen/qwen3.5-4b-base
qwen/qwen3.5-4b
License
apache-2.0
apache-2.0
Availability
Open weights
Open weights
Hosted by
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Input price
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Decision accuracy
83.8%
80.1%
Calibration error
0.042
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Valid action rate
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Median latency
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62.8 ms
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 kev and metask-jev?
kev is from Jared Palmer and metask-jev from Metask Lab. Both have open weights you can download and run. Both answer choice, score, noul, classify and route questions. kev reads up to 8K tokens of state, against 4K tokens for metask-jev. kev is the smaller model, at 4.0B parameters to 4.5B.
Which is more accurate, kev or metask-jev?
They report on different suites — kev 83.8% on transfer-v4 (locked, out of domain), metask-jev 80.1% on JevBench v1.2 public set (231 items) at 4,096 tokens, maker's run — so the numbers do not rank them. Test both on your own labelled examples.
Which is cheaper, kev or metask-jev?
kev: Free (open weights). metask-jev: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Can I run kev or metask-jev locally?
Yes, both: systemone pull jared-palmer/kev and systemone pull metask-lab/metask-jev download the weights.
Evaluation suite
transfer-v4 (locked, out of domain)
JevBench v1.2 public set (231 items) at 4,096 tokens, maker's run
