Cursor and Cline for V4 flash or suggestions?

I'm running the Cursor agent interface on Linux. Inside it, I installed Cline and hooked up my DS API Key, and I set it to use the flash model not the pro, with the thinking/processing depth at medium. I assumed the peak hours would be during the day (I'm in Asia right now). I woke up in the middle of the night and did a couple of tasks. However, seeing other people share their usage here makes it seem like mine is a bit expensive. At this rate, my main tasks might take over billion tokens and that is roughly $20 or more. I know the cost calculation is not exactly as simple just like that but is there any other harness or agent I can try that might provide more efficiency or less expense?