Context Sumarization

I am getting close to the end of a long chat with 5.1 and I'd like there to be a context summarization option once I get to a certain percentage of maximum context. Studies show that degradation starts at around 25 percent and 75 percent would be the max I'd go, but having an auto summarizer that you can set to a certain percentage would be amazing.  Claude and GPT5 I believe have this feature and it would be good to have for longer chats