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

https://xeon-wiki.win/index.php/Why_Does_GPT-5.2_Cost_More_Than_GPT-5.1%3F

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