The AI Models Index keeps tabs on premium model releases from 15 labs since...

https://ericksexcellentblog.image-perth.org/which-weekday-do-ai-labs-usually-ship-new-premium-models

The AI Models Index keeps tabs on premium model releases from 15 labs since 2023, with verified launch dates and blind-vote quality checks. Updated every two weeks, it shows the pace of innovation — like GPT-5.2 rolling out just 4.5 days after GPT-5