The AI Models Index keeps tabs on premium AI releases from 15 labs since 2023,...

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

The AI Models Index keeps tabs on premium AI releases from 15 labs since 2023, verifying dates and using blind-vote checks for accuracy. Updated biweekly, it shows the pace of innovation—like GPT-5.2 launching just 4.5 days after GPT-5