The AI Models Index tracks model releases with verified public release dates...

https://wiki-dale.win/index.php/What_Does_a_95%25_Confidence_Band_Mean_on_LMArena%3F

The AI Models Index tracks model releases with verified public release dates and blind-vote checks, so you can compare changes before upgrading instead of guessing. It covers 178 releases and shows a 16% regression rate, helping teams spot risk early.