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

https://holdensimpressivethoughts.lumenforgex.com/posts/why-did-gemini-s-lmarena-numbers-not-match-published-snapshots

The AI Models Index tracks premium model releases from 15 labs since 2023, verifying dates and using blind-vote checks to ensure accuracy. Updated every two weeks, it shows the pace of progress—like how GPT-5.2 rolled out just 4.5 days after GPT-5