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HEAD TO HEAD
Interfaze AI: lev and wfzyx: von, compared on what they decide, where they run, what they cost and what their publishers report.
| Property | interfaze-ai/lev | wfzyx/von |
|---|---|---|
| Summary | 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. | A ModernBERT-large encoder with an option-marker head. Premise and options are packed into one sequence and each option's marker is scored in a single bidirectional pass; version 1.2 makes the scoring order-invariant. |
| Decides | choice, score, noul, classify, route | choice, score, noul, classify |
| Architecture | lev | von |
| Fine-tuned from | qwen/qwen3.5-4b | answerdotai/modernbert-large |
| License | apache-2.0 | apache-2.0 |
| Availability | Open weights | Open weights |
| Hosted by | — | — |
| Input price | — | — |
| Decision accuracy | 68.9% | 63.9% |
| Calibration error | 0.115 | 0.045 |
| Valid action rate | — | — |
| Median latency | 69 ms | 18 ms |
| p95 latency | — | — |
| Evaluation suite | S1Bench (13 public subsets, macro) | JevBench public standard tier |
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.
lev is from Interfaze AI and von from wfzyx. Both have open weights you can download and run. Both answer choice, score, noul and classify questions. Only lev answers route. von is the smaller model, at 395M parameters to 4.0B.
They report on different suites — lev 68.9% on S1Bench (13 public subsets, macro), von 63.9% on JevBench public standard tier — so the numbers do not rank them. Test both on your own labelled examples.
lev: Free (open weights). von: Free (open weights). Open weights cost nothing per call beyond your own hardware.
By their publishers’ figures, von answers in about 18 ms at the median and lev in about 69 ms — measured on different hardware, so treat it as a rough guide.
Yes, both: systemone pull interfaze-ai/lev and systemone pull wfzyx/von download the weights.
| Latest version | 2026.09 | 1.2.0 |
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| Variants | — | — |
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| Size of latest version | 195.1 MB | 2.9 GB |
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| Files | 8 | 2 |
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| Downloads | 0 | 0 |
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| Stars | 0 | 0 |
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| Tags | system-one, qwen, lora, calibrated, 4b | system-one, encoder, modernbert, 395m |
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| Updated | Sep 27, 2026 | Sep 27, 2026 |
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