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HEAD TO HEAD
Mapika: decider and wfzyx: von, compared on what they decide, where they run, what they cost and what their publishers report.
| Property | mapika/decider | wfzyx/von |
|---|---|---|
| Summary | The most-downloaded open System One reproduction. Merged Qwen3.5 fine-tunes, trained on about 95 public decision sets, then calibration-aware RL and a rank-64 LoRA, that softmax letter logits at an answer slot. | 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 | decider | von |
| Fine-tuned from | qwen/qwen3.5-2b-base | answerdotai/modernbert-large |
| License | apache-2.0 | apache-2.0 |
| Availability | Open weights | Open weights |
| Hosted by | — | — |
| Input price | — | — |
| Decision accuracy | 80.2% | 63.9% |
| Calibration error | 0.038 | 0.045 |
| Valid action rate | — | — |
| Median latency | 3.2 ms | 18 ms |
| p95 latency | — | — |
| Evaluation suite | Decider 67-task regression set | 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.
decider is from Mapika and von from wfzyx. Both have open weights you can download and run. Both answer choice, score, noul and classify questions. Only decider answers route. von is the smaller model, at 395M parameters to 2.0B.
They report on different suites — decider 80.2% on Decider 67-task regression set, von 63.9% on JevBench public standard tier — so the numbers do not rank them. Test both on your own labelled examples.
decider: Free (open weights). von: Free (open weights). Open weights cost nothing per call beyond your own hardware.
By their publishers’ figures, decider answers in about 3.2 ms at the median and von in about 18 ms — measured on different hardware, so treat it as a rough guide.
Yes, both: systemone pull mapika/decider 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 | 3.5 GB | 2.9 GB |
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| Files | 4 | 2 |
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| Downloads | 0 | 0 |
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| Stars | 0 | 0 |
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| Tags | system-one, qwen, rl, calibrated, 2b | system-one, encoder, modernbert, 395m |
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| Updated | Sep 26, 2026 | Sep 26, 2026 |
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