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

https://penelopessmartdigests.talesignal.com/posts/what-win-rate-counts-as-a-real-step-vs-a-big-step-in-ai-model-progress

The AI Models Index tracks premium model releases from 15 top labs since 2023, verifying release dates and using blind-vote checks for accuracy. Updated every two weeks, it shows models improving release speed by 56%, with GPT-5.2 launching just 4