Auto is not a model, auto is the mystery box option that cursor gives people who are too slow to read a documentation and flip a few switches. With auto you're going to get routed to any model that happens to be the most available and cheap at the moment. Rather you should specify composer or grok as they both charge under cursors auto category - which by the way can be used just fine through cursors cli and ide. Also auto pool usage isn't infinite, just hard to exhaust.