Uirapuru U1

A post-trained version of Qwen3.5-9B-Base focused on improving instruction following, Brazilian Portuguese, English, reasoning, and practical assistant capabilities.

Overview

Uirapuru U1 is a post-trained large language model developed by SynastrIA Networks. Instead of training a model from scratch, U1 builds upon the strong foundation of Qwen3.5-9B-Base and specializes it through supervised post-training.

The project prioritizes:

  • High-quality instruction following
  • Natural Brazilian Portuguese
  • Strong English performance
  • Better reasoning
  • Tool calling
  • Helpful, safe and practical conversations

Base Model

  • Base: Qwen3.5-9B-Base
  • Architecture: Decoder-only Transformer
  • Training Type: Post-training (Supervised Fine-Tuning)

Languages

Primary support:

  • Portuguese (Brazil)
  • English

General multilingual capabilities are inherited from the base model.

Training

Uirapuru U1 was post-trained using a curated instruction dataset composed of Portuguese and English conversations.

Training objectives include:

  • Instruction following
  • Question answering
  • Reasoning
  • Code understanding
  • Tool calling
  • Conversation quality
  • Knowledge formatting
  • Writing assistance

Intended Uses

Uirapuru U1 is intended for:

  • AI assistants
  • Chatbots
  • Coding assistance
  • Educational applications
  • Content generation
  • Summarization
  • Translation
  • Tool-calling agents
  • General NLP research

Limitations

Like any language model, Uirapuru U1 may:

  • Produce incorrect or outdated information.
  • Make reasoning mistakes.
  • Reflect biases inherited from training data.
  • Generate confident but inaccurate responses.

Human verification is recommended for important or high-risk tasks.

Evaluation

During development, emphasis was placed on:

  • Instruction adherence
  • Portuguese fluency
  • English quality
  • Reasoning performance
  • Response consistency
  • Tool calling reliability

Formal benchmark results will be published in future releases.

Safety

Uirapuru U1 was designed to be a helpful assistant while avoiding harmful or unsafe outputs whenever possible.

The model should not be relied upon as the sole source for legal, financial or medical decisions.

Citation

@misc{uirapuruu1,
  title={Uirapuru U1},
  author={SynastrIA Networks},
  year={2026},
  howpublished={Hugging Face}
}

Acknowledgements

Uirapuru U1 is built upon the excellent Qwen3.5-9B-Base model developed by the Qwen team.

Special thanks to the open-source AI community for the tools, libraries and research that made this project possible.

License

This repository follows the license and usage requirements of the base model. Please review the original Qwen license before deployment.

Downloads last month
33
Safetensors
Model size
10B params
Tensor type
BF16
·
F32
·
Inference Providers NEW
This model isn't deployed by any Inference Provider. 🙋 1 Ask for provider support

Model tree for SynastriaNetworks/Uirapuru-U1-9B

Finetuned
(147)
this model
Quantizations
2 models

Space using SynastriaNetworks/Uirapuru-U1-9B 1