My best score is 14782, on Terra Atlantos. It is a Cosmically Enlightened Post Singularity society, including the Integrated Societies bonus. I made a Reddit post about it, and I also have the actual mission report.
My highest ever was 14k-something also. This was on an old phone, can't prove it, sorry. But I like interesting results much better than high scores... My favorite was a Cosmic Enlightenment Neolithic on a beautiful moon.