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The URL you posted:
https://chatgpt.com/api/auth/session
is not an official public API for developers. It’s an internal endpoint used by the ChatGPT web app itself.
What it actually is
That endpoint is part of the browser version of ChatGPT and is used to:
Check if you are logged in
Return basic session info (user id, email, etc.)
Help the web UI know your authentication state
Internally, it returns data like your session/user object (when you’re logged in), but it is not documented or supported for external use.
Important points
❌ Not part of the OpenAI API (not for developers)
❌ Requires browser cookies / login session
❌ Will not work like a normal API endpoint with an API key
⚠️ Can change anytime without notice
⚠️ Using it outside the web app can break or violate terms of use
Why people see it
It appears in:
browser dev tools (Network tab)
reverse engineering of ChatGPT web app
custom wrappers trying to mimic ChatGPT behavior
What you should use instead
If your goal is to build with ChatGPT, you should use the official API:
https://api.openai.com/v1/responses (modern)
or https://api.openai.com/v1/chat/completions (older chat endpoint)
These are:
stable
documented
meant for apps, bots, and services
Simple summary
That /api/auth/session link is basically:
“ChatGPT web app checking who is logged in”
It’s not something you can or should use as a real API endpoint.
If you want, tell me what you were trying to do with that link (login automation, API access, bot, etc.), and I’ll point you to the correct approach.