The same thing has been happening to me for a few days now, I created a thread a few hours ago to see if it happened to anyone else, you can see it here: Impossible to work with o1 Pro, anyone Else Experiencing This?
I contacted OpenAi support and so far the only response I received was “Retry the request again later, visit our status page to check for any active outages, try another browser, check my internet connection, use incognito mode”…