# Felhen: saracura-ptbr

> A Brazilian Portuguese decision model on the Kev recipe: a LoRA adapter and pointer head on Qwen3.5-4B-Base, initialised from kev-4b and fine-tuned on Portuguese decisions. Answers choice, yes/no and score questions in one pass and serves /v1/systemone.

- Page: https://systemonemodels.ai/felhen-ai/saracura-ptbr
- API: https://api.systemonemodels.ai/v1/models/felhen-ai/saracura-ptbr
- Download: `pip install systemonemodels && systemone pull felhen-ai/saracura-ptbr`

## Facts

| | |
|---|---|
| Maker | Felhen (https://systemonemodels.ai/felhen-ai) |
| Decides | choice, score, noul, classify |
| Architecture | kev |
| Base model | jared-palmer/kev |
| Parameters | 4.0B |
| Context | 2K tokens |
| Licence | apache-2.0 |
| Availability | Open weights |
| Released | 2026-10-06 |
| Latest version | 2026.09 |

## Reported evaluation

Suite: felhen-ai/ptbr-typed-decisions-bench v1 test split, 7 tasks, mean balanced accuracy (the maker's own). Numbers are the publisher's own.

- Decision accuracy: 73.1%

## Model card

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# Saracura PT-BR 4B

A Brazilian Portuguese decision model on the Kev recipe: a LoRA adapter and pointer head on Qwen3.5-4B-Base, initialised from kev-4b and fine-tuned on Portuguese decisions. Answers choice, yes/no and score questions in one pass and serves /v1/systemone.

The test split comes from the same sources as training; the only task outside training (a Banco Central FAQ) scores 96.8%. Claim checking on FACTCK.BR is near chance, and the maker says confidence is not calibrated on the user's data. Needs a GPU, or Apple Silicon through MLX. head.pt is a PyTorch pickle. The maker's own run of the third-party Decision Index gives 37.91, submitted but not yet accepted. Sibling saracura-ptbr-v0 (322M, on Laya multilingual).

## 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
- **classify** — assigns a category from a fixed taxonomy

## At a glance

| | |
|---|---|
| Parameters | 4B |
| Base model | `jaredpalmer/kev-4b` |
| Maker | Felhen |
| Released | 2026-10-06 |
| License | apache-2.0 |
| Reported accuracy | 73.1% |
| Reported latency | 100 to 170 ms per decision on an RTX 5090 in bf16 |

## Get the weights

```bash
pip install systemonemodels
systemone pull felhen-ai/saracura-ptbr
```

The files are served from the maker's Hugging Face repository, [`felhen-ai/saracura-ptbr-4b`](https://huggingface.co/felhen-ai/saracura-ptbr-4b), and verified against the checksums recorded here.

## Read more

- [Model card](https://huggingface.co/felhen-ai/saracura-ptbr-4b)
- [saracura-ptbr-v0 (322M)](https://huggingface.co/felhen-ai/saracura-ptbr-v0)
- [Code](https://github.com/felhen-ai/saracura)

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*This page was opened by System One for Felhen, 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