The AI Models Index tracks premium model releases from 15 leading labs since...

https://sierra-wiki.win/index.php/What_Does_the_Index_Mean_by_%22Release_Day%22_Counting%3F

The AI Models Index tracks premium model releases from 15 leading labs since 2023, verifying release dates and blind-vote checks to ensure accuracy. Updated every two weeks, it shows a 56% improvement rate in model performance, with examples like GPT-5