The AI Models Index tracks 178 model releases with verified public release...

https://holdensimpressivethoughts.lumenforgex.com/posts/what-days-of-the-week-do-ai-labs-usually-release-models

The AI Models Index tracks 178 model releases with verified public release dates and blind-vote checks, so you can compare changes without relying on launch claims. See how upgrades performed and decide whether a switch is worth a 4.5-day retest.