# pngwn: system-one-qwen3-5-4b-scorer

> 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.

- Page: https://systemonemodels.ai/pngwn/system-one-qwen3-5-4b-scorer
- API: https://api.systemonemodels.ai/v1/models/pngwn/system-one-qwen3-5-4b-scorer
- Download: `pip install systemonemodels && systemone pull pngwn/system-one-qwen3-5-4b-scorer`

## Facts

| | |
|---|---|
| Maker | pngwn (https://systemonemodels.ai/pngwn) |
| Decides | choice, score, noul, classify |
| Architecture | scorer |
| Base model | qwen/qwen3.5-4b-base |
| Parameters | 4.0B |
| Licence | cc-by-nc-4.0 |
| Availability | Open weights |
| Released | 2026-09-16 |
| Latest version | 2026.09 |

## Reported evaluation

Suite: author-reported. Numbers are the publisher's own.

- Decision accuracy: 70.7%
- Calibration error (ECE): 0.044
- Median latency: 112 ms

## Model card

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# System One scorer (Qwen3.5-4B)

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.

A rank-16 LoRA and a scalar head (30.5M trainable parameters) on the frozen base; the repository holds the adapter only. Reported 70.7% with a calibration error of 0.044; 112 ms per question with 4 options, 560 ms with 77. The CC-BY-NC-4.0 licence is inherited from the ticket data it was trained on, so it cannot be used commercially and is not mirrored here.

## What it decides

- **choice** — picks one option from a set
- **score** — places the input on an ordered scale
- **noul** — answers a yes/no question with one calibrated probability
- **classify** — assigns a category from a fixed taxonomy

## At a glance

| | |
|---|---|
| Parameters | 4B |
| Base model | `qwen/qwen3.5-4b-base` |
| Maker | pngwn |
| Released | 2026-09-16 |
| License | cc-by-nc-4.0 |
| Reported accuracy | 70.7% |
| Reported latency | 112 ms per question at 4 options; 560 ms at 77 |

## Get the weights

```bash
pip install systemonemodels
systemone pull pngwn/system-one-qwen3-5-4b-scorer
```

The files are served from the maker's Hugging Face repository, [`pngwn/system-one-qwen3.5-4b-scorer`](https://huggingface.co/pngwn/system-one-qwen3.5-4b-scorer), and verified against the checksums recorded here.

## Read more

- [Weights on Hugging Face](https://huggingface.co/pngwn/system-one-qwen3.5-4b-scorer)

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*This page was opened by System One for pngwn, who can claim the organisation and take it over at any time.*

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From System One Models — https://systemonemodels.ai/ · every System One model: https://systemonemodels.ai/system-one-models