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That URL — `https://chatgpt.com/api/auth/session` — is an internal ChatGPT web session endpoint, not the public developer API. It is used by the ChatGPT website to check login/session state in your browser. ([pastein.ru][1])

A few important points:

* It may return session-related JSON when you are logged in through a browser.
* The contents can include authentication/session data tied to your account.
* It is **not** intended as a stable or supported API for external apps or automation. ([pastein.ru][1])

Security note: if someone asks you to open this page and send them the JSON, treat that carefully. Community reports and third-party sites describe using copied session data to access or modify accounts or apply subscriptions. ([Reddit][2])

If your goal is something specific—such as:

* checking what this endpoint returns,
* building an app,
* automating login,
* or understanding the JSON—

tell me what you want to do with it and I’ll explain the appropriate approach.

[1]: https://pastein.ru/t/00D?utm_source=chatgpt.com "Pastein: 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 endp"
[2]: https://www.reddit.com/r/TunisiaTech/comments/1rya2jx/is_this_a_scam_someone_asked_me_to_copy_my/?utm_source=chatgpt.com "Is this a scam? Someone asked me to copy my ChatGPT “auth session”"