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 release dates and using blind votes to ensure accuracy. Updated every two weeks, it shows a steady pace—like GPT-5.2 launching just 4.5 days after GPT-5