The AI Models Index tracks premium model releases from 15 labs since 2023,...

https://stateofseo.com/understanding-the-difference-between-point-releases-and-new-generations-in-large-language-models/

The AI Models Index tracks premium model releases from 15 labs since 2023, verifying dates and using blind-vote checks to ensure accuracy. Updated every two weeks, it shows the pace of progress—like how GPT-5.2 rolled out just 4.5 days after GPT-5