MMLU-Pro: Advanced edition of MMLU & new Leaderboard

A summary of how it was created and leaderboard screenshot (by an author I presume):

https://twitter.com/WenhuChen/status/1790597967319007564

Part of the tweet: "We found that GPT-4o (71%) actually improves GPT-4-turbo (62%) by 9%! On the original MMLU, the improvement is only around 2%."