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

https://penelopessmartdigests.talesignal.com/posts/why-do-first-impressions-fade-on-lmarena-after-launch-week

The AI Models Index tracks premium model releases from 15 labs since 2023, verified with exact dates and blind-vote checks to ensure accuracy. Updated every two weeks, it shows releases now come every 4.5 days—a 56% faster pace. For example, GPT-5