# Avishek Biswas: bev-decider

> A 0.4B decision model made from the first 20 layers of Qwen3-0.6B plus a small attention head that compares options. It answers choice, noul and score questions in one pass, and choice order cannot change its answer by construction. Non-commercial licence.

- Page: https://systemonemodels.ai/avishek-biswas/bev-decider
- API: https://api.systemonemodels.ai/v1/models/avishek-biswas/bev-decider
- Download: `pip install systemonemodels && systemone pull avishek-biswas/bev-decider`

## Facts

| | |
|---|---|
| Maker | Avishek Biswas (https://systemonemodels.ai/avishek-biswas) |
| Decides | choice, score, noul |
| Architecture | bev-decider |
| Base model | qwen/qwen3-0.6b |
| Parameters | 478M |
| Context | 2K tokens |
| Licence | cc-by-nc-4.0 |
| Availability | Open weights |
| Released | 2026-09-28 |
| Latest version | 2026.09 |

## Reported evaluation

Suite: avbiswas/bev-decision test split (5,000 held-out questions over 2,617 states), the maker's own. Numbers are the publisher's own.

- Decision accuracy: 74.7%

## Model card

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# bev-decider-0.4B

A 0.4B decision model made from the first 20 layers of Qwen3-0.6B plus a small attention head that compares options. It answers choice, noul and score questions in one pass, and choice order cannot change its answer by construction. Non-commercial licence.

A personal project by Avishek Biswas. Each option is read in parallel from the same position ids and a new two-layer head compares them, so the answer does not depend on option order. Takes Jev's /v1/systemone request format. On the maker's own bev-decision test split (5,000 held-out questions) it scores 74.7% overall: choice 69.8, yes/no 84.6, score 63.7; weakest on answer verification and temporal or unit questions. The CC BY-NC 4.0 licence is inherited from the training data's terms.

## 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 probability

## At a glance

| | |
|---|---|
| Parameters | 478M |
| Base model | `Qwen/Qwen3-0.6B` |
| Maker | Avishek Biswas |
| Released | 2026-09-28 |
| License | cc-by-nc-4.0 |
| Reported accuracy | 74.7% |

## Get the weights

```bash
pip install systemonemodels
systemone pull avishek-biswas/bev-decider
```

The files are served from the maker's Hugging Face repository, [`avbiswas/bev-decider-0.4B`](https://huggingface.co/avbiswas/bev-decider-0.4B), and verified against the checksums recorded here.

## Read more

- [Model card](https://huggingface.co/avbiswas/bev-decider-0.4B)
- [Code](https://github.com/avbiswas/bev-decider)

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*This page was opened by System One for Avishek Biswas, 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