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

https://chloesbrilliantjournal.capitaljays.com/posts/why-does-gpt-5.2-cost-more-than-gpt-5.1

The AI Models Index tracks premium releases from 15 leading labs since 2023, with verified dates and blind-vote checks to ensure accuracy. Updated biweekly, it shows an average of one new release every 4.5 days—a 56% faster pace than before