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

# Introduction

> AI model API service, compatible with the OpenAI standard format. One key to call multiple models.

Compatible with the OpenAI standard format

One API Key, call multiple AI models

Seamlessly switch between GPT, Claude, Gemini, and other models. Projects already using the OpenAI SDK only need to replace the endpoint address and key to connect.

[Quickstart](https://docs.nodesms.com/en/aitoken/quickstart.md)

[Integration Guide](https://docs.nodesms.com/en/aitoken/api/overview.md)

Base URL

`https://t.ato2.nodesms.com/v1`

## Supported Capabilities

> **[Chat](https://docs.nodesms.com/en/aitoken/api/chat-completions.md)**
>
> Supports ChatCompletions, Responses, and text completion formats.

> **[Embeddings and Reranking](https://docs.nodesms.com/en/aitoken/api/embeddings.md)**
>
> Text vectorization and document reranking for RAG, search ranking, and similar scenarios.

> **[Images](https://docs.nodesms.com/en/aitoken/api/images.md)**
>
> Image generation and image editing, compatible with the OpenAI Images API.

> **[Audio](https://docs.nodesms.com/en/aitoken/api/audio-speech.md)**
>
> Audio synthesis, audio transcription, and audio translation.

> **[Video](https://docs.nodesms.com/en/aitoken/api/videos.md)**
>
> Create video generation tasks and query task status.

> **[Moderation](https://docs.nodesms.com/en/aitoken/api/moderations.md)**
>
> Check whether text content violates usage policies.

## Three-Step Integration

**1. Register and log in**

Visit [https://t.ato2.nodesms.com](https://t.ato2.nodesms.com) to register an account.

**2. Create an API Key**

Create a token on the token management page and copy the Key starting with `sk-`.

**3. Send a request**

Set the SDK `base_url` to `https://t.ato2.nodesms.com/v1` and start calling. See [Quickstart](https://docs.nodesms.com/en/aitoken/quickstart.md) for details.


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