> ## Documentation Index
> Fetch the complete documentation index at: https://docs.checkthat-ai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Unified LLM access platform with built-in claim normalization and fact-checking

<Frame>
  <img src="https://mintcdn.com/checkthatai/k0W1LwrYCtZyQnF6/images/hero-light.png?fit=max&auto=format&n=k0W1LwrYCtZyQnF6&q=85&s=808ac3490f92a5b32c303671d3e34d86" alt="CheckThat AI Platform" className="block dark:hidden" width="1920" height="1080" data-path="images/hero-light.png" />

  <img src="https://mintcdn.com/checkthatai/k0W1LwrYCtZyQnF6/images/hero-dark.png?fit=max&auto=format&n=k0W1LwrYCtZyQnF6&q=85&s=c68a152d8cd7b80701b3881ac06d57a6" alt="CheckThat AI Platform" className="hidden dark:block" width="1920" height="1080" data-path="images/hero-dark.png" />
</Frame>

**CheckThat AI** is a unified LLM access platform that connects you to **11+ models** from leading AI providers through a single API. Built with integrated fact-checking and claim normalization capabilities, it's the perfect solution for applications requiring both AI power and truth verification.

<CardGroup cols={2}>
  <Card title="🚀 Quick Start" icon="rocket" href="/quickstart">
    Get started with CheckThat AI in under 5 minutes
  </Card>

  <Card title="🔌 Python SDK" icon="python" href="/api-reference/python-sdk">
    Install our Python SDK for seamless integration
  </Card>

  <Card title="📖 API Reference" icon="code" href="/api-reference/introduction">
    Complete API documentation and endpoints
  </Card>

  <Card title="🔑 Authentication" icon="key" href="/api-reference/authentication">
    Learn how to authenticate with provider API keys
  </Card>
</CardGroup>

## Key Features

<CardGroup cols={2}>
  <Card title="Unified LLM Access" icon="network-wired">
    Access **OpenAI, Anthropic, Google Gemini, xAI, and Together AI** models through one API
  </Card>

  <Card title="Built-in Fact-Checking" icon="shield-check">
    Every response includes **claim verification** and evidence sourcing
  </Card>

  <Card title="OpenAI Compatible" icon="robot">
    **Drop-in replacement** for OpenAI SDK - no code changes required
  </Card>

  <Card title="Multiple Providers" icon="globe">
    Switch between providers seamlessly with your existing API keys
  </Card>
</CardGroup>

## Supported Models

<Tabs>
  <Tab title="OpenAI">
    * **GPT-5** - Latest flagship model
    * **GPT-4o** - Optimized for speed and accuracy
    * **o3** - Advanced reasoning model
    * **o4-mini** - Efficient lightweight model
  </Tab>

  <Tab title="Anthropic">
    * **Claude Sonnet 4** - Latest conversational AI
    * **Sonnet Opus 4.1** - Most capable Claude model
    * **Claude 3.5 Sonnet** - Balanced performance
  </Tab>

  <Tab title="Google">
    * **Gemini 2.5 Pro** - Advanced multimodal model
    * **Gemini 2.5 Flash** - Fast inference model
    * **Gemini Pro** - General purpose model
  </Tab>

  <Tab title="Others">
    * **xAI Grok 4** - Latest Grok model
    * **Together AI Llama 3.3 70B** - Open source model
    * **Deepseek R1 Distill** - Efficient reasoning model
  </Tab>
</Tabs>

## Getting Started

<Steps>
  <Step title="Install the SDK">
    Install CheckThat AI Python SDK via pip:

    ```bash theme={null}
    pip install checkthat-ai
    ```
  </Step>

  <Step title="Get your API keys">
    Obtain API keys from the providers you want to use:

    * [OpenAI](https://platform.openai.com/api-keys)
    * [Anthropic](https://console.anthropic.com)
    * [Google AI](https://ai.google.dev)
    * [xAI](https://x.ai)
    * [Together AI](https://together.ai)
  </Step>

  <Step title="Make your first request">
    Use CheckThat AI exactly like the OpenAI SDK:

    ```python theme={null}
    from checkthat_ai import CheckThatAI

    client = CheckThatAI(api_key="your-openai-key")

    response = client.chat.completions.create(
        model="gpt-4o",
        messages=[
            {"role": "user", "content": "Fact-check: The Earth is round"}
        ]
    )

    print(response.choices[0].message.content)
    ```
  </Step>
</Steps>

## Why CheckThat AI?

<CardGroup cols={3}>
  <Card title="🔄 One API, Multiple Providers" icon="arrows-rotate">
    No need to manage multiple SDKs or endpoints. Switch between OpenAI, Anthropic, Google, and more with a single interface.
  </Card>

  <Card title="✅ Built-in Fact-Checking" icon="check-circle">
    Every response includes claim analysis, verification, and evidence sourcing - perfect for applications requiring accuracy.
  </Card>

  <Card title="🚀 Zero Migration Effort" icon="rocket">
    Drop-in replacement for OpenAI SDK. Your existing code works immediately with enhanced capabilities.
  </Card>
</CardGroup>

## Ready to Start?

<Card title="View the Quick Start Guide" icon="play" href="/quickstart" horizontal>
  Get up and running with CheckThat AI in under 5 minutes
</Card>

## Community & Support

<CardGroup cols={3}>
  <Card title="GitHub" icon="github" href="https://github.com/nikhil-kadapala/checkthat-ai">
    View source code and contribute
  </Card>

  <Card title="PyPI Package" icon="python" href="https://pypi.org/project/checkthat-ai/">
    Install the Python SDK
  </Card>

  <Card title="Contact Support" icon="envelope" href="mailto:kadapalanikhil@gmail.com">
    Get help from our team
  </Card>
</CardGroup>