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HEAD TO HEAD
Jared Palmer: kev and Interfaze AI: lev, compared on what they decide, where they run, what they cost and what their publishers report.
| Property | jared-palmer/kev | interfaze-ai/lev |
|---|---|---|
| Summary | 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. | An open System One model from Interfaze AI. A rank-32 LoRA on Qwen3.5-4B reads yes/no, choice and score answers from the logits of one forward pass, returns calibrated probabilities and serves the /v1/systemone API. |
| Decides | choice, score, noul, classify, route | choice, score, noul, classify, route |
| Architecture | kev | lev |
| 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 | — | — |
| Input price | — | — |
| Decision accuracy | 83.8% | 68.9% |
| Calibration error | 0.042 | 0.115 |
| Valid action rate | — | — |
| Median latency | — | 69 ms |
| p95 latency | — | — |
| 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.
kev is from Jared Palmer and lev from Interfaze AI. Both have open weights you can download and run. Both answer choice, score, noul, classify and route questions.
They report on different suites — kev 83.8% on transfer-v4 (locked, out of domain), lev 68.9% on S1Bench (13 public subsets, macro) — so the numbers do not rank them. Test both on your own labelled examples.
kev: Free (open weights). lev: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Yes, both: systemone pull jared-palmer/kev and systemone pull interfaze-ai/lev download the weights.
| S1Bench (13 public subsets, macro) |
| Latest version | 2026.09 | 2026.09 |
|---|
| Variants | — | — |
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| Size of latest version | 152.2 MB | 195.1 MB |
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| Files | 11 | 8 |
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| Downloads | 0 | 0 |
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| Stars | 0 | 0 |
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| Tags | system-one, qwen, lora, pointer-head, 4b | system-one, qwen, lora, calibrated, 4b |
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| Updated | Sep 27, 2026 | Sep 27, 2026 |
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