Your company brain, inside ChatGPT.

Your team already lives in ChatGPT. Add Brainstack as an app and it answers with your clients, prices and decisions instead of guessing, with the source and within each person's role.

Connect ChatGPT to my brain See the steps

ChatGPT on the web
Business, Enterprise and Edu
Sign in with Brainstack, no API keys

Sample data

ChatGPTLELeo · Sales

Brainstack

Draft a follow-up to Bluebird Co from Tuesday's call.

Brainstack · Clients

Here's a draft. It confirms the November 6 kickoff, answers their question about data import, and asks who signs now that their CFO has changed.

Call notes, Oct 20HubSpot

Connect ChatGPT in five steps.

Short answer: yes, through ChatGPT's developer mode, on ChatGPT on the web. Turn on developer mode, create an app with your brain's address, sign in with Brainstack and pick it in a chat. On Business and Enterprise, an admin sets it up once for the workspace.

1
Copy your brain's address
It's in Brainstack, under team AI access.
2
Turn on developer mode
Developer mode is the part of ChatGPT that lets you add your own apps. It's in beta at OpenAI.
On Business, Enterprise and Edu, a workspace admin turns it on and decides who can add apps.
ChatGPT
Settings
Advanced
Developer modeBeta · add your own MCP apps
MemoryReference saved memories
3
Create the Brainstack app
Create a new app, name it Brainstack, paste your brain's address and choose OAuth as the sign-in.
https://brain.example.com/mcp
4
Sign in with Brainstack
ChatGPT opens Brainstack's sign-in. Each person uses their own account, so ChatGPT gets their access and nothing more.
Brainstack
ChatGPT wants to use your Brainstack brain
Signed in as Leo · Sales. It will see only what your role can open:
Knowledge
Tasks
Projects
DenyAllow
5
Pick it in a chat and ask
Start a chat, choose Brainstack from the + menu and ask the way you always do.
ChatGPTLELeo · Sales
Brainstack
What's overdue on the Northwind account?
Brainstack · Tasks
Send the Q4 roadmap (due Nov 15, owner: you)
Confirm who signs the renewal
Message ChatGPT

Brainstack

Team AI accessBeta

Your brain's address. Paste it into any AI app that supports MCP.

https://brain.example.com/mcp

Example address. Yours is in your dashboard.

ChatGPT

Settings

Advanced

Developer modeBeta · add your own MCP apps
MemoryReference saved memories

ChatGPT

New appNameBrainstackMCP server URLhttps://brain.example.com/mcpAuthenticationOAuth

CancelCreate

Brainstack

ChatGPT wants to use your Brainstack brain

Signed in as Leo · Sales. It will see only what your role can open:

Knowledge
Tasks
Projects

DenyAllow

ChatGPTLELeo · Sales

Brainstack

What's overdue on the Northwind account?

Brainstack · Tasks

Send the Q4 roadmap (due Nov 15, owner: you)
Confirm who signs the renewal

What your team can ask ChatGPT now.

Pick a question to see the answer. In beta, ChatGPT reaches knowledge, tasks and projects.

ChatGPTLELeo · Sales

What did Bluebird push back on in the last call?

Brainstack · Clients

Two things: the onboarding fee, which they want spread over three months, and data import, which they expect us to handle.

Call notes, Oct 20

Same ChatGPT. Different answers.

Each person's ChatGPT answers with that person's access. Ask as Anna in Finance, then as Marta in Marketing.

ChatGPTANAnna · Finance

How much have we invoiced Halcyon Foods this year?

Brainstack · Finance

$48,600 across 11 invoices. One is overdue: #1043 for $1,080, due October 15.

Xero

ChatGPT and Brainstack, at a glance.

Where it works: ChatGPT on the web. Apps added in developer mode don't show up in the mobile apps.
ChatGPT plans: Business, Enterprise and Edu. Pro can connect it to read, not to create tasks.
Who sets it up: A workspace admin turns on developer mode and adds the Brainstack app. Each person then signs in with their own account.
Sign-in: OAuth with each person's Brainstack account. No API keys to share.
What ChatGPT can reach: Knowledge, tasks and projects (beta), only in the spaces that person's role can open.
Where your data lives: The brain stays on your own server in the US or Europe. OpenAI processes what ChatGPT receives under your ChatGPT plan's terms.

Questions, answered.

Does ChatGPT work with Brainstack?

Yes. ChatGPT can connect to remote MCP servers as apps in developer mode, and your company brain is one. Once connected, ChatGPT answers from your knowledge, tasks and projects, within each person's role.

Which ChatGPT plans can use it?

Business, Enterprise and Edu, on ChatGPT on the web. On Pro, developer mode can connect it to read but not to take actions such as creating tasks. The Free plan doesn't support it.

Is developer mode safe to turn on?

Developer mode lets ChatGPT use tools from servers you add, so OpenAI asks you to add only servers you trust. Brainstack is your own company's server: every call signs in as a person and never goes past their role.

Can I use it in the ChatGPT mobile app?

Not today. Apps added in developer mode work in ChatGPT on the web.

Will ChatGPT see everything in our brain?

No. ChatGPT signs in as one person and sees only the spaces that person's role can open.

What does it cost?

Team AI access comes with every Brainstack plan, from $99 a month. Your team keeps the ChatGPT plan it already pays for.

ChatGPT support checked on October 26, 2026.