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

https://technivorz.com/how-long-does-google-take-between-announcing-and-shipping-a-model/

The AI Models Index tracks premium model releases from 15 labs since 2023, verifying dates and using blind-vote checks for accuracy. Updated every two weeks, it shows development speeds improving by 56%, with some models like GPT-5