Without knowing anything about your benchmark, it might be your harness at fault here. I say this because with longer thinking you run the risk of filling up your context faster and you need a good context compaction strategy in your harness to mitigate that.
I have heard good things about Pi which supports auto-compaction, but I can't personally vouch for it since I use my own.
I have heard good things about Pi which supports auto-compaction, but I can't personally vouch for it since I use my own.