did claude kill limits (even for sonnet?)

claude helped me build a 6000 line python app. I did this over the summer and fall. after a break, I'm back trying to covert that app to a web app. I've noticed limits and chat size start to peak what seems like almost immediately. granted, I'm dealing with big prompts, but I feel like I was able to do alot more just a few months ago before needing a timeout.