# How to connect Cartesia with ChatGPT

```json
{
  "title": "How to connect Cartesia with ChatGPT",
  "toolkit": "Cartesia",
  "toolkit_slug": "cartesia",
  "framework": "ChatGPT",
  "framework_slug": "chatgpt",
  "url": "https://composio.dev/toolkits/cartesia/framework/chatgpt",
  "markdown_url": "https://composio.dev/toolkits/cartesia/framework/chatgpt.md",
  "updated_at": "2026-10-23T05:31:57.604Z"
}
```

## Introduction

### How to connect Cartesia MCP with ChatGPT
[ChatGPT](https://chatgpt.com/) can take action across your apps and files, stay with a project for hours, and turn a goal into finished materials like sheets, slides, and docs, not just answers.
In this guide, I will explain the easiest and most secure way to connect your Cartesia account to ChatGPT via Composio Connect, so it can generate speech, transcribe audio, manage voices, train models, and build voice agents through natural language commands without ever putting your account credentials at risk.

## Also integrate Cartesia with

- [Claude Cowork](https://composio.dev/toolkits/cartesia/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/cartesia/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/cartesia/framework/atomic-agent)

## TL;DR

### Why use Composio over default connectors?
- Apps with read and write access. Default connectors mostly can read your data. Composio's Cartesia integration lets ChatGPT take actions like creating drafts, sending updates, labeling records, and more.
- 1,500+ SaaS toolkits out of the box. Composio gives you instant access to a vast catalog of pre-built connectors, from Gmail and Slack to Notion, Linear, and Salesforce.
- One MCP server for every app. Connect any of your applications on demand through a single endpoint, rather than juggling a separate server for each app.
- Smart, context-aware tool loading. Unlike traditional MCP servers that dump every available tool into the LLM context window, Composio searches for and loads only the tools relevant to the task at hand.
- Cross-app automation. Chain actions across multiple apps in a single run - fetch a thread, summarize it in Notion, and post highlights to Slack without leaving the conversation.

## Connect Cartesia to ChatGPT

### Prerequisites
- A ChatGPT account. We will use the [ChatGPT desktop app](https://openai.com/chatgpt/download/), and the steps are the same on the web.
- Access to the Cartesia workspace you want to connect.
- [Composio plugin](https://dashboard.composio.dev/login?utm_source=toolkits&utm_medium=framework_template&utm_campaign=chatgpt&utm_content=composio_connect&next=%2F~%2Forg%2Fconnect%2Fclients%2Fchatgpt).
Note: Composio connects through OAuth. You will be asked to sign in and approve specific permissions. Review the permission screen carefully if you are using a work account.
### Step-by-step: Connect Cartesia to ChatGPT
### 1. Install the Composio plugin
Click the button. ChatGPT opens the Composio plugin page. Click Install plugin.
[Install in ChatGPT](https://chatgpt.com/plugins/plugin_asdk_app_6a58503580c08191b78cc5bdaf4eba6e)
You can also find it inside ChatGPT: go to Settings, open Plugins, search the marketplace for Composio, and click Install plugin.
### 2. Authenticate
After you install, ChatGPT asks you to authenticate with Composio. Log in and click Allow access to authorize ChatGPT to use your Composio account.
### 3. Start using Composio
That is it. Composio tools are now available in ChatGPT. Type @Composio followed by your request, for example @Composio find unread Cartesia messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize Cartesia.
### Option 2: Add Composio as an MCP server
If you cannot use the plugin marketplace, add Composio as a custom MCP server instead.
### 1. Open the MCP settings
In ChatGPT, go to Settings and open the Plugins section. Inside the Plugins page, click the MCP tab.
### 2. Add the server
Click Add server. In the Name field enter Composio, for Type select Streamable HTTP, and in the URL field paste the Composio MCP server URL:

```bash
https://connect.composio.dev/mcp
```

## What is the Cartesia MCP server, and what's possible with it?

The Cartesia MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Cartesia account. It provides structured and secure access to voice, speech synthesis, pronunciation dictionary, accent, and managed agent model capabilities, so your agent can generate audio from text, find suitable voices, check supported accents, manage pronunciation dictionaries, and review available agent models on your behalf.
- Text-to-speech generation: Have your agent turn a complete transcript into a downloadable audio file using a selected Cartesia voice.
- Voice discovery: Let the agent search Cartesia voices and retrieve synthesis details to help choose the right voice for an audio project.
- Accent exploration: Direct your agent to list supported accents and filter them by language, locale, or voice localization support.
- Pronunciation dictionary management: Instruct your agent to create, review, update, list, or delete reusable pronunciation dictionaries for more consistent speech generation.
- Managed agent model selection: Have your agent review available Cartesia managed agent models, including provider, latency, and pricing details.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `CARTESIA_CREATE_PRONUNCIATION_DICTIONARY` | Create Pronunciation Dictionary | Create a reusable pronunciation dictionary for text-to-speech generation. |
| `CARTESIA_DELETE_PRONUNCIATION_DICTIONARY` | Delete Pronunciation Dictionary | Permanently delete one pronunciation dictionary by ID. |
| `CARTESIA_GET_PRONUNCIATION_DICTIONARY` | Get Pronunciation Dictionary | Return one pronunciation dictionary and its complete text-to-pronunciation mappings. |
| `CARTESIA_GET_VOICE` | Get Voice | Return synthesis-relevant details for one Cartesia voice by ID. |
| `CARTESIA_LIST_ACCENTS` | List Accents | List supported accents, optionally filtered by language, locale, or voice-localization support. |
| `CARTESIA_LIST_AGENT_MODELS` | List Agent Models | List language models available to Cartesia Managed Agents, including provider, latency, and pricing metadata. |
| `CARTESIA_LIST_PRONUNCIATION_DICTIONARIES` | List Pronunciation Dictionaries | Return one page of pronunciation dictionaries available to the connected account. |
| `CARTESIA_LIST_VOICES` | List Voices | Search and filter Cartesia voices, returning one page of voice IDs and synthesis-relevant metadata. |
| `CARTESIA_SYNTHESIZE_SPEECH` | Synthesize Speech | Generate a downloadable audio file from one complete transcript using a selected Cartesia voice; usage is billed by transcript length. |
| `CARTESIA_UPDATE_PRONUNCIATION_DICTIONARY` | Update Pronunciation Dictionary | Update a pronunciation dictionary and replace its mappings with the complete supplied item set. |

## Supported Triggers

None listed.

## Creating MCP Server - Stand-alone vs Composio SDK

Once connected, ChatGPT can access the Cartesia MCP server via Composio to run actions that you authorize, directly in your workspace.

## Complete Code

None listed.

## How to build Cartesia MCP Agent with another framework

- [Claude Cowork](https://composio.dev/toolkits/cartesia/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/cartesia/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/cartesia/framework/atomic-agent)

## Related Toolkits

- [Composio](https://composio.dev/toolkits/composio) - Composio is an integration platform that connects AI agents with hundreds of business tools. It streamlines authentication and lets you trigger actions across services—no custom code needed.
- [Composio search](https://composio.dev/toolkits/composio_search) - Composio search is a unified web search toolkit spanning travel, e-commerce, news, financial markets, images, and more. It lets you and your apps tap into up-to-date web data from a single, easy-to-integrate service.
- [Perplexityai](https://composio.dev/toolkits/perplexityai) - Perplexityai delivers natural, conversational AI models for generating human-like text. Instantly get context-aware, high-quality responses for chat, search, or complex workflows.
- [Browser tool](https://composio.dev/toolkits/browser_tool) - Browser tool is a virtual browser integration that lets AI agents interact with the web programmatically. It enables automated browsing, scraping, and action-taking from any AI workflow.
- [Ai ml api](https://composio.dev/toolkits/ai_ml_api) - Ai ml api is a suite of AI/ML models for natural language and image tasks. It provides fast, scalable access to advanced AI capabilities for your apps and workflows.
- [Aivoov](https://composio.dev/toolkits/aivoov) - Aivoov is an AI-powered text-to-speech platform offering 1,000+ voices in over 150 languages. Instantly turn written content into natural, human-like audio for any application.
- [All images ai](https://composio.dev/toolkits/all_images_ai) - All-Images.ai is an AI-powered image generation and management platform. It helps you create, search, and organize images effortlessly with advanced AI capabilities.
- [AltTextLab](https://composio.dev/toolkits/alt_text_lab) - AltTextLab is an AI service that generates accessible, SEO-aware alt text for images. It helps teams make image content easier to understand, index, and publish.
- [Anthropic administrator](https://composio.dev/toolkits/anthropic_administrator) - Anthropic administrator is an API for managing Anthropic organizational resources like members, workspaces, and API keys. It helps you automate admin tasks and streamline resource management across your Anthropic organization.
- [Api labz](https://composio.dev/toolkits/api_labz) - Api labz is a platform offering a suite of AI-driven APIs and workflow tools. It helps developers automate tasks and build smarter, more efficient applications.
- [Apiframe](https://composio.dev/toolkits/apiframe) - Apiframe is an API platform for generating and managing AI images, videos, music, uploads, assets, jobs, and custom LoRAs. It gives developers one clean API for creative AI workflows without juggling multiple model providers.
- [Apipie ai](https://composio.dev/toolkits/apipie_ai) - Apipie ai is an AI model aggregator offering a single API for accessing top AI models from multiple providers. It helps developers build cost-efficient, latency-optimized AI solutions without juggling multiple integrations.
- [Arize AX](https://composio.dev/toolkits/arize_ax) - Arize AX is an AI engineering platform for tracing, evaluating, and improving AI applications. Use it to debug LLM behavior, compare experiments, and improve production AI quality.
- [Artificial Analysis](https://composio.dev/toolkits/artificial_analysis) - Artificial Analysis is an independent benchmarking platform for AI models and API providers. Use it to compare model intelligence, coding, math, pricing, latency, throughput, and arena rankings.
- [AssemblyAI](https://composio.dev/toolkits/assemblyai) - AssemblyAI is a speech-to-text and audio intelligence API for uploaded or hosted media. Use it to turn audio and video into accurate transcripts, summaries, and insights.
- [Astica ai](https://composio.dev/toolkits/astica_ai) - Astica ai provides APIs for computer vision, NLP, and voice synthesis. Integrate advanced AI features into your app with a single API key.
- [Avoma](https://composio.dev/toolkits/avoma) - Avoma is an AI meeting assistant for recording, transcribing, analyzing, and managing meetings, calls, notes, scorecards, and conversation intelligence. It helps teams turn conversations into searchable notes, follow-ups, coaching insights, and revenue intelligence.
- [Bigml](https://composio.dev/toolkits/bigml) - BigML is a machine learning platform that lets you build, train, and deploy predictive models from your data. Its intuitive interface and robust API make machine learning accessible and efficient.
- [Black Forest Labs](https://composio.dev/toolkits/bfl) - Black Forest Labs provides hosted FLUX models for generating and editing images and videos. It offers fast, flexible media creation with asynchronous processing and fine-tuning support.
- [Bland AI](https://composio.dev/toolkits/bland_ai) - Bland AI is a conversational AI platform for building voice agents, phone calls, messaging, and communication workflows. Use it to automate calling, evaluate conversations, and run voice operations at scale.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Cartesia MCP?

With a standalone Cartesia MCP server, the agents and LLMs can only access a fixed set of Cartesia tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Cartesia and many other apps based on the task at hand, all through a single MCP endpoint.

### Can I use Tool Router MCP with ChatGPT?

Yes, you can. ChatGPT fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Cartesia tools.

### Can I manage the permissions and scopes for Cartesia while using Tool Router?

Yes, absolutely. You can configure which Cartesia scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

### How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Cartesia data and credentials are handled as safely as possible.

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