The AI Models Index keeps tabs on premium releases from 15 top labs since 2023,...

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

The AI Models Index keeps tabs on premium releases from 15 top labs since 2023, verifying dates and using blind-vote checks for accuracy. Updated every two weeks, it shows that new models now come out every 4.5 days on average—a 56% faster pace