Who famous Yale grads made the best grades?

There's no publicly available database of Yale graduates' grades, and even if there were, releasing such information would be a significant privacy violation. Grade information from colleges is generally confidential.

Therefore, it's impossible to definitively say which famous Yale grads made the "best" grades. While some may have been known for academic excellence during their time at Yale (perhaps through awards or mentions in yearbooks), the actual GPA or class rank is not typically released.