I use it with a local Qwen3.8 27B on llama-server, but I don't know what it means for it exceed any window.

you can use /slots on the llama-server if you want to get more up-to-date details on session token use.

I always run models in their default context, which is 262144 for Qwen3.8 27B. I've run sessions in hax where it hit that cap multiple times and compressed the context down to 15% and continued with no problem.