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

https://felixssuperperspective.brightsora.com/posts/which-deep-research-ai-was-best-at-finding-correct-release-dates

The AI Models Index tracks premium model releases from 15 labs since 2023, verifying dates and using blind-vote checks for accuracy. Updated every two weeks, it shows that in 2026, new models arrive every 4.5 days—a 56% speedup from before