The AI Models Index tracks premium model releases from 15 labs since 2023, with...

https://rileysnewcolumn.readspirex.com/posts/why-does-gpt-5.2-cost-more-than-gpt-5.1

The AI Models Index tracks premium model releases from 15 labs since 2023, with verified dates and blind-vote checks to ensure accuracy. Updated every two weeks, it shows the pace of innovation—like improvements occurring every 4.5 days in 2026