I was not aware that they had changed the plan to a dynamic cap. I think I not the only one surprised, here a user mentions that GPTs have a lower usage cap Error in input stream... all day long - #12 by joshuad, but perhaps they where just experiencing the dynamic usage cap in play.
To OpenAI, please don’t be like Tinder. In any case, you need to let us know when we are approaching the cap and how many messages remain. On a few occasions I have run in to the cap after an hour or two and been unable to save my work from the code interpreter. By the time the usage resets, the code interpreter has expired along with any files. I have lost a good few hours time from this, and it makes me nervous about using the advanced features. If I am not using those features, I am better served with the api.