ChatGPT · Connect your AI

Custom connectors in developer mode. Business, Enterprise and Edu get full support; Pro gets read access. Web only.

ChatGPT connects to the brain as a custom MCP app in developer mode. Full support (read and write) needs a Business, Enterprise or Edu workspace; Pro accounts get read access. It is web only: connectors do not appear in the mobile apps or in voice mode.

At a glance

Works on	chatgpt.com and the desktop apps. Not on mobile, not in voice mode
Plans	Business, Enterprise, Edu (full). Pro (read only). Free and Plus are not supported by OpenAI for custom MCP apps
Admin step	On Business, Enterprise and Edu a workspace admin enables developer mode first
Sign-in	OAuth. ChatGPT opens a LAN Brain sign-in page
Time	Five minutes, plus the admin step if needed

Before you start

Copy your MCP URL from the dashboard (Your brain, then Connect AI client):

text

https://YOUR-BRAIN.brain.lanbrain.ai/mcp

Step 1: turn on developer mode

If you are on Business: a workspace owner opens Workspace settings, then Apps, and toggles developer mode there. Connectors created by an admin can be published to the whole workspace from Apps, then Drafts, then Publish.

If you are on Enterprise or Edu: an admin enables it under Workspace settings, then Permissions and Roles, then Connected Data. Members then turn it on for themselves under Settings, then Apps, then Advanced settings, then Developer mode.

If you are on Pro: open Settings, then Apps (some builds label it Apps & Connectors), then Advanced settings, and turn on Developer mode. You will be able to read the brain but not write to it.

Schematic of ChatGPT Settings, Apps, Advanced settings with Developer mode on. Labels as of September 2026.

Step 2: create the connector

In Settings, then Apps, click Create.
Name it (for example LAN Brain), add a one-line description, and paste your MCP URL as the MCP server URL.
Authentication: choose OAuth. Leave client ID and secret empty.
Click Create. ChatGPT discovers the sign-in server, opens a LAN Brain page, and asks you to approve. Use the same account you use for the dashboard.
When it returns, ChatGPT lists the brain's tools. Leave them enabled.

Schematic of the Create form: name, description, MCP server URL, OAuth, Create. Labels as of September 2026.

Step 3: tell ChatGPT to use the brain

Copy the instructions block from the dashboard's Connect AI client tab.
Open Settings, then Personalization, then Custom instructions, make sure customization is enabled, and paste the block into the field about how ChatGPT should respond.
Save. It applies to every new chat.

Why this step matters.

Using it in a chat

In a new chat, click the + button next to the message box, open More, and pick your connector. ChatGPT then calls the brain when a question needs it. If you changed anything on the brain side (new tools after an upgrade), open the app in Settings and click Refresh.

Try it

"Search my company brain: what is our current position on remote work, and where is it documented?"
"Prepare me for tomorrow's call with Vierci. Pull everything the brain has on them and list open items."
"Draft next week's team update from the last seven days of changes in the brain."

If something is off

No Developer mode toggle: your plan does not include it, or your admin has not enabled it. Free and Plus do not get custom MCP apps.
The connector disappears after a while: ChatGPT lost the refresh token. Open the app in Settings and sign in again.
It works on the web but not on my phone: expected. OpenAI has not shipped MCP apps on mobile.
Tools show but ChatGPT answers from memory: paste the instructions block (Step 3) and start a new chat.