The AI Models Index keeps you updated on premium releases from 15 labs since...

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

The AI Models Index keeps you updated on premium releases from 15 labs since 2023, with verified dates and blind-vote checks to ensure accuracy. Updated every two weeks, it tracks improvements like the 56% faster rollout seen between GPT-5.1 and GPT-5.2