Get your OpenAI API key
This is the regular key an app's connect box asks for. It starts with
sk-proj-. It stays on your device and the app talks to OpenAI directly
with it, billed to your own account.
Steps
Sign in to the OpenAI platform
Go to platform.openai.com and sign in, creating the account if you don't have one.
Open the API keys page
Go straight to platform.openai.com/api-keys, or click API Keys in the sidebar.

Create the key
Click Create new secret key. Name it after the app you're connecting, keep Project on Default project and Permissions on All, then click Create secret key.

Copy the key and paste it into the app
Copy the sk-proj-... key right away. OpenAI shows it only once. If
you lose it, delete it there and make a new one. Paste it into the app's connect
box. To cut the app off later, delete that key on the same OpenAI page.
sk-admin-, stop.
That is an admin key. It controls your whole organization and no app should ever
see it. Apps take sk-proj- keys; the admin key is only for
connecting your account to Outlet.Learn more
OpenAI's official quickstart: platform.openai.com/docs/quickstart.