Hit my GPT Pro (5X) limit in less than a day without hitting my 5-hour limit once

I’m a long time Claude sub user and decided to try out GPT Pro sub as I heard it has better usage limit than Claude. In just an overnight session running xhigh effort, I am on my 75% weekly usage limit. I would have expected my 5-hour limit would have triggered first before getting into this ridiculous usage. Does openai not stop a session if it hits the 5-hour limit? How many 5-hour limit is a weekly usage limit?