The AI Models Index keeps tabs on premium model releases from 15 labs since...

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

The AI Models Index keeps tabs on premium model releases from 15 labs since 2023, with verified dates and blind-vote checks to ensure accuracy. Updated every two weeks, it shows releases now come every 4.5 days—a 56% faster pace