My very brief interaction with GPT5 is that it's just weird.

"Sure, I'll help you stop flirting with OOMs"

"Thought for 27s Yep-..." (this comes out a lot)

"If you still graze OOM at load"

"how far you can push --max-model-len without more OOM drama"

- all this in a prolonged discussion about CUDA and various llm runners. I've added special user instructions to avoid flowery language, but it gets ignored.

EDIT: it also dragged conversation for hours. I ended up going with latest docs and finally, all issues with CUDA in a joint tabbyApi and exllamav2 project cleared up. It just couldn't find a solution and kept proposing, whatever people wrote in similar issues. It's reasoning capabilities are in my eyes greatly exaggarated.