The AI Models Index tracks premium model releases from 15 leading labs since...

https://riversexpertchat.cloudhinter.com/posts/what-happened-to-gpt-5-vs-gpt-4.5-lead-over-time

The AI Models Index tracks premium model releases from 15 leading labs since 2023, with verified dates and blind-vote checks to ensure accuracy. Updated every two weeks, it shows a 56% faster release rate on average—like how GPT-5.2 rolled out just 4