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

# Features & Capabilities

> APIMart supported features and compatibility information

## What AI models are supported?

APIMart supports various mainstream AI models, including:

* **Text Models**: GPT-5, Claude, Gemini, etc.
* **Image Models**: GPT-4o-image, Gemini-2.5-Flash-Image-preview, etc.
* **Video Models**: Sora2, VEO3, etc.
* **Audio Models**: Whisper-1, TTS, etc.

Please check the [API Documentation](/en/index) for specific supported models.

## How compatible is it with OpenAI API?

APIMart is fully compatible with OpenAI API format, allowing you to:

* Directly replace the API endpoint
* Use the same request format
* No need to modify existing code
* Support all major OpenAI API features

<Info>
  Simply replace the original OpenAI API endpoint `https://api.openai.com` with `https://api.apimart.ai` for seamless migration.
</Info>

## Why do API responses differ from official web versions (like ChatGPT, Claude)?

While using the same underlying models, there are differences between official web versions and API calls:

**Official Web Versions** include extensive engineering optimizations and enhanced features:

* Built-in internet search for real-time information
* Conversation memory that automatically links context
* Built-in calculator and code execution environment
* Pre-configured system prompts
* Optimized user interface

**API Calls** provide raw model capabilities:

* Only core reasoning and generation abilities
* Developers must manually manage conversation history
* Requires manual configuration of system prompts and context
* Requires self-integration of tool calling (Function Calling)

<Tip>
  **Development Tip**: When using the API, actively configure system prompts (system messages), maintain conversation history, and integrate tool calling features as needed to achieve an experience closer to the web version.
</Tip>