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

https://harperscoolthoughts.inkharbory.com/posts/why-are-some-releases-marked-not-rated-or-gray-in-the-timeline

The AI Models Index tracks premium AI model releases from 15 labs since 2023, verifying dates and applying blind-vote checks for accuracy. Updated every two weeks, it shows the pace is quickening—models like GPT-5.2 launch just 4.5 days after GPT-5