---
library_name: transformers
license: apache-2.0
license_link: LICENSE
pipeline_tag: image-text-to-text
base_model:
- Qwen/Qwen3.5-2B
tags:
- verus
- coding
- reasoning
- r1
language:
- en
---

# Verus-r1

[![License: Apache 2.0](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
[![Model Size](https://img.shields.io/badge/Parameters-2B-brightgreen)]()
[![Context](https://img.shields.io/badge/Context-262K%20tokens-orange)]()
[![HF Transformers](https://img.shields.io/badge/Transformers-%E2%89%A54.52-red)](https://github.com/huggingface/transformers)

> [!Note]
> This repository contains model weights and configuration files for **Verus-r1** in the Hugging Face Transformers format.
>
> Compatible with Hugging Face Transformers, vLLM, SGLang, and other major inference frameworks.
>
> Built for **coding**, **reasoning**, **debugging**, and concise general assistance.

## Verus-r1 Highlights

- **Coding-Focused**: Writes, fixes, explains, and reviews code.
- **Reasoning-Oriented**: Works through multi-step problems clearly.
- **Long Context**: Can handle large prompts, files, and long conversations.
- **Instruction Following**: Responds in the format and style requested.
- **Efficient**: A compact 2B model for local or hosted inference.

## Model Overview

| Property | Value |
|---|---|
| Parameters | ~2B |
| Context Length | **262,144 tokens** |
| Architecture | Qwen3.5 |
| Chat Format | ChatML (`<\|im_start\|>` / `<\|im_end\|>`) |
| Dtype | bfloat16 |
| License | Apache 2.0 |

## Quickstart

### Installation

```bash
pip install "transformers>=4.52.0" accelerate torch
```

### Code Generation

```python
from transformers import AutoTokenizer, AutoModelForCausalLM
import torch

MODEL_ID = "8F-ai/Verus-r1"

tokenizer = AutoTokenizer.from_pretrained(MODEL_ID)
model = AutoModelForCausalLM.from_pretrained(
    MODEL_ID,
    torch_dtype=torch.bfloat16,
    device_map="auto",
)
model.eval()

messages = [
    {
        "role": "system",
        "content": "You are Verus-r1, a reasoning coding assistant made by 8F-ai. You think through problems carefully before responding."
    },
    {
        "role": "user",
        "content": "Write a Python async context manager that manages a PostgreSQL connection pool using asyncpg."
    }
]

text = tokenizer.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
inputs = tokenizer(text, return_tensors="pt").to(model.device)

with torch.inference_mode():
    generated_ids = model.generate(**inputs, max_new_tokens=2048, temperature=0.6, top_p=0.95)

output = tokenizer.decode(generated_ids[0][len(inputs.input_ids[0]):], skip_special_tokens=True)
print(output)
```

### Quantized Inference (4-bit NF4, ~2 GB VRAM)

```python
from transformers import AutoModelForCausalLM, AutoTokenizer, BitsAndBytesConfig
import torch

quantization_config = BitsAndBytesConfig(
    load_in_4bit=True,
    bnb_4bit_compute_dtype=torch.bfloat16,
    bnb_4bit_use_double_quant=True,
    bnb_4bit_quant_type="nf4",
)

tokenizer = AutoTokenizer.from_pretrained("8F-ai/Verus-r1")
model = AutoModelForCausalLM.from_pretrained(
    "8F-ai/Verus-r1",
    quantization_config=quantization_config,
    device_map="auto",
)
```

## Intended Use Cases

| Use Case | Example |
|---|---|
| **Code Generation** | Write functions, classes, and scripts |
| **Debugging** | Fix bugs from code or error messages |
| **Code Review** | Explain code and suggest improvements |
| **Reasoning** | Break down multi-step problems |
| **Long Context** | Work with long prompts and files |
| **General Q&A** | Answer clearly and concisely |

## Limitations

- **English-Primary**: Fine-tuning was conducted predominantly on English-language code and documentation.

## Citation

```bibtex
@misc{verusr12026,
  title        = {Verus-r1: A Reasoning-Focused Coding Language Model with 262K Context},
  author       = {8F-ai},
  year         = {2026},
  howpublished = {\url{https://huggingface.co/8F-ai/Verus-r1}},
  note         = {Apache 2.0 License}
}
```

## License

Verus-r1 is released under the **Apache License 2.0**. See [LICENSE](LICENSE) for full terms.

Derived from [Qwen/Qwen3.5-2B](https://huggingface.co/Qwen/Qwen3.5-2B) (Apache 2.0).

---

<div align="center">
  <sub>Built by the 8F-ai Team</sub>
</div>