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

https://penelopessmartdigests.talesignal.com/posts/how-do-i-compare-two-models-using-blind-votes-instead-of-launch-posts

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