The AI Models Index tracks premium model 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 tracks premium model releases from 15 top labs since 2023, with verified launch dates and blind-vote quality checks. Updated biweekly, it shows the pace of innovation—like a 56% improvement rate between GPT-5.1 and GPT-5.2