The AI Models Index keeps you up to date with premium model releases from 15...

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

The AI Models Index keeps you up to date with premium model releases from 15 top labs since 2023, verified by release dates and blind-vote checks. Updated every two weeks, it shows improvements like a 56% faster release rate—GPT-5