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

https://emiliosbestinsights.rivetgarden.com/posts/can-a-model-lose-on-lmarena-but-still-be-better-for-coding

The AI Models Index tracks premium model releases from 15 labs since 2023, verifying dates and using blind-vote checks for accuracy. Updated biweekly, it shows a steady pace—like GPT-5.2 rolling out just 4.5 days after GPT-5.1, a 56% faster release rate