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

# Use Your ChatGPT Plan with AI Sync

> Connect Codex, signed in with your own ChatGPT plan, to your AI Sync account and build agents, prompts and workflows by asking.

If you pay for ChatGPT (Plus, Pro or Business), you can use that plan to build
inside AI Sync. No API key, no extra AI bill.

You connect **Codex**, OpenAI's assistant that runs on your ChatGPT plan, to
your AI Sync account once. After that you type what you want, and it does the
work in your account.

```mermaid theme={null}
graph LR
    A[🧑 You ask Codex] --> B[🧠 Codex thinks<br/>on your ChatGPT plan]
    B --> C[🔐 AI Sync tools<br/>signed in as you]
    C --> D[✅ Agent, prompt or workflow<br/>created in your account]
```

<Note>
  Codex only sees **your** account, and only after you sign in and approve it.
  It can do what your AI Sync login can do, nothing more.
</Note>

## 🧭 Set it up (about 5 minutes, once)

<Steps>
  <Step title="Install or update Codex and sign in with ChatGPT">
    Open the **Terminal** app and run:

    ```bash theme={null}
    npm install -g @openai/codex@latest && codex login
    ```

    Choose **Sign in with ChatGPT** when asked. If you already have Codex, still
    run this: an older Codex can refuse your plan's newest model.
  </Step>

  <Step title="Add your AI Sync account">
    ```bash theme={null}
    codex mcp add ai-sync --url https://mcp.aisync.link/mcp-oauth
    ```

    Your browser opens an AI Sync sign-in page. Sign in with your normal AI Sync
    login and approve.
  </Step>

  <Step title="If no sign-in page opened">
    ```bash theme={null}
    codex mcp login ai-sync
    ```

    Then sign in and approve in the browser.
  </Step>

  <Step title="Check it worked">
    ```bash theme={null}
    codex mcp list
    ```

    `ai-sync` should show **OAuth** in the Auth column.
  </Step>
</Steps>

You can also copy these commands in AI Sync: click your profile (top right) → **Settings** → **Integration** → **MCP** → **Connect** → **Codex** tab.

## 💬 Three things to ask first

Open Codex (type `codex` in Terminal) and try:

<CardGroup cols={1}>
  <Card title="Write a voice agent prompt" icon="microphone">
    "Create a new inbound agent called *Front Desk* and write and save a prompt for
    a friendly medspa receptionist who answers Botox pricing questions and offers
    to book a consultation."
  </Card>

  <Card title="Build a workflow" icon="diagram-project">
    "Create a draft workflow: when a contact gets the tag *no-show*, wait one day,
    then send them a text asking to rebook. Leave it off so I can review it."
  </Card>

  <Card title="Ask about your numbers" icon="chart-line">
    "How many calls did my reps make this week, and what was each rep's connect
    rate?"
  </Card>
</CardGroup>

<Tip>
  Ask for workflows as **drafts** and turn them on yourself after a look. Codex
  will do exactly what you ask, including turning things on.
</Tip>

## ❓ Good to know

* **It uses your ChatGPT plan's limits.** Heavy use can hit your plan's usage
  cap; it resets on ChatGPT's schedule.
* **Prefer an API key?** You can still paste an OpenAI key under
  **Settings → Integration → OpenAI** for workflow AI steps.
* **Disconnect any time:** `codex mcp logout ai-sync`.

See also [Connect your AI assistant (MCP)](/connect-mcp) and
[Asking about your data](/agents/asking-about-your-data).