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

https://andysexpertblog.nexorafield.com/posts/how-can-i-stop-re-testing-every-ai-release-myself-at-work

The AI Models Index tracks premium model releases from 15 labs since 2023, verifying launch dates and using blind votes to ensure accuracy. Updated every two weeks, it shows a steady pace—like the 4.5 days between GPT-5.1 and GPT-5