---
language:
- multilingual
license: other
license_name: kwaipilot-license
license_link: LICENSE
library_name: transformers
---
<div align="center">
  <img src="https://raw.githubusercontent.com/Anditty/OASIS/refs/heads/main/Group.svg" width="60%" alt="Kwaipilot" />
</div>

<hr>

<div align="center" style="line-height: 1;">
  <a href="https://huggingface.co/Kwaipilot/KAT-V1-40B" target="_blank">
    <img alt="Hugging Face" src="https://img.shields.io/badge/HuggingFace-fcd022?style=for-the-badge&logo=huggingface&logoColor=000&labelColor"/>
  </a>
  
  <a href="https://arxiv.org/pdf/2507.08297" target="_blank">
    <img alt="arXiv" src="https://img.shields.io/badge/arXiv-2507.08297-b31b1b.svg?style=for-the-badge"/>
  </a>
</div>

# News

- Kwaipilot-AutoThink ranks first among all open-source models on [LiveCodeBench Pro](https://livecodebenchpro.com/), a challenging benchmark explicitly designed to prevent data leakage, and even surpasses strong proprietary systems such as Seed and o3-mini.

***

# Introduction

**KAT (Kwaipilot-AutoThink)** is an open-source large-language model that mitigates *over-thinking* by learning **when** to produce explicit chain-of-thought and **when** to answer directly. 

![image/png](https://cdn-uploads.huggingface.co/production/uploads/61ee40a269351366e29972ad/zdnsvBmv6hWIC2Qxxy1fD.png)

Its development follows a concise two-stage training pipeline:

<table>
  <thead>
    <tr>
      <th style="text-align:left; width:18%;">Stage</th>
      <th style="text-align:left;">Core Idea</th>
      <th style="text-align:left;">Key Techniques</th>
      <th style="text-align:left;">Outcome</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><strong>1. Pre-training</strong></td>
      <td>Inject knowledge while separating “reasoning” from “direct answering”.</td>
      <td>
        <em>Dual-regime data</em><br>
        • <strong>Think-off</strong> queries labeled via a custom tagging system.<br>
        • <strong>Think-on</strong> queries generated by a multi-agent solver.<br><br>
        <em>Knowledge Distillation&nbsp;+&nbsp;Multi-Token Prediction</em> for fine-grained utility.
      </td>
      <td>Base model attains strong factual and reasoning skills without full-scale pre-training costs.</td>
    </tr>
    <tr>
      <td><strong>2. Post-training</strong></td>
      <td>Make reasoning optional and efficient.</td>
      <td>
        <em>Cold-start AutoThink</em> — majority vote sets the initial thinking mode.<br>
        <em>Step-SRPO</em> — intermediate supervision rewards correct <strong>mode selection</strong> and <strong>answer accuracy</strong> under that mode.
      </td>
      <td>Model triggers CoT only when beneficial, reducing token use and speeding inference.</td>
    </tr>
  </tbody>
</table>

![image/png](https://cdn-uploads.huggingface.co/production/uploads/61ee40a269351366e29972ad/cwFAEh7Rl3f4FU46z8gBZ.png)


***

# Data Format


KAT produces responses in a **structured template** that makes the reasoning path explicit and machine-parsable.  
Two modes are supported:


![image/jpeg](https://cdn-uploads.huggingface.co/production/uploads/61ee40a269351366e29972ad/H8iAvQMMT02nyvlYnI5q1.jpeg)


## Special Tokens

| Token | Description |
|-------|-------------|
| `<judge>` | Analyzes the input to decide whether explicit reasoning is needed. |
| `<think_on>` / `<think_off>` | Indicates whether reasoning is **activated** (“on”) or **skipped** (“off”). |
| `<think>` | Marks the start of the chain-of-thought segment when `think_on` is chosen. |
| `<answer>` | Marks the start of the final user-facing answer. |


***

# 🔧 Quick Start

```python
from transformers import AutoTokenizer, AutoModelForCausalLM

model_name = "Kwaipilot/KAT-V1-40B"

# load the tokenizer and the model
tokenizer = AutoTokenizer.from_pretrained(model_name, trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(
    model_name,
    torch_dtype="auto",
    device_map="auto"
)

# prepare the model input
prompt = "Give me a short introduction to large language model."
messages = [
    {"role": "user", "content": prompt}
]
text = tokenizer.apply_chat_template(
    messages,
    tokenize=False,
    add_generation_prompt=True
)
model_inputs = tokenizer([text], return_tensors="pt").to(model.device)

# conduct text completion
generated_ids = model.generate(
    **model_inputs,
    max_new_tokens=65536,
    temperature=0.6,
    top_p=0.95,
)
output_ids = generated_ids[0][len(model_inputs.input_ids[0]):].tolist() 
content = tokenizer.decode(output_ids, skip_special_tokens=True).strip("\n")
print("prompt:\n", prompt)
print("content:\n", content)
"""
prompt:
Give me a short introduction to large language model.
content:
<judge>
The user's request is to provide a concise factual introduction to large language models, which involves retrieving and summarizing basic information. This task is straightforward as it only requires recalling and presenting well-known details without deeper analysis. No complex reasoning is needed here—just a simple explanation will suffice.
</judge>

<think_off>
<answer>
A **Large Language Model (LLM)** is an advanced AI system trained on vast amounts of text data to understand, generate, and process human-like language. Here’s a concise introduction:

### Key Points:
1. **Training**: Trained on diverse text sources (books, websites, etc.) using deep learning.
2. **Capabilities**: 
   - Answer questions, generate text, summarize content, translate languages.
   - Understand context, sentiment, and nuances in language.
3. **Architecture**: Often based on **transformer models** (e.g., BERT, GPT, LLaMA).
4. **Scale**: Billions of parameters, requiring massive computational resources.
5. **Applications**: Chatbots, content creation, coding assistance, research, and more.

### Examples:
- **OpenAI’s GPT-4**: Powers ChatGPT.
- **Google’s Gemini**: Used in Bard.
- **Meta’s LLaMA**: Open-source alternative.

### Challenges:
- **Bias**: Can reflect biases in training data.
- **Accuracy**: May hallucinate "facts" not grounded in reality.
- **Ethics**: Raises concerns about misinformation and job displacement.

LLMs represent a leap forward in natural language processing, enabling machines to interact with humans in increasingly sophisticated ways. 🌐🤖
</answer>
"""
```

***

# Future Releases

Looking ahead, we will publish a companion paper that fully documents the **AutoThink training framework**, covering:

* Cold-start initialization procedures  
* Reinforcement-learning (Step-SRPO) strategies  
* Data curation and reward design details  

At the same time, we will open-source:

* **Training resources** – the curated dual-regime datasets and RL codebase  
* **Model suite** – checkpoints at 1.5B, 7B, and 13B parameters, all trained with AutoThink gating