The AI Models Index keeps track of premium model releases from 15 labs since...

https://deansinspiringperspective.hexaforgey.com/posts/why-did-gemini-s-lmarena-numbers-not-match-published-snapshots

The AI Models Index keeps track of premium model releases from 15 labs since 2023, verifying release dates and using blind-vote checks to ensure accuracy. Updated every two weeks, it shows that the average time between releases improved by 56% in 2026