Yale is notorious for grade inflation, and has refused to release GPA stats publicly for years:
"Yale College, the undergraduate school at Yale University, inflates grades: 62% of grades awarded to Yale undergraduates are A or A-. (Compare that to 40 years ago, when just 1 out of 10 grades fell in the A range.) "
https://www.businessinsider.com/13-schools-where-its-really-hard-to-fail-2013-5
“According to a 2017 Yale News article, 92% of Yale faculty believe there is grade inflation at Yale.”