The AI Models Index keeps tabs on premium model releases from 15 labs, tracking...

https://fair-wiki.win/index.php/Is_GPT-5.2_More_Expensive_Than_GPT-5.1%3F_A_Data-Driven_Look_at_AI_Model_Pricing_Trends

The AI Models Index keeps tabs on premium model releases from 15 labs, tracking verified launch dates and using blind-vote checks to ensure accuracy. Updated every two weeks, it shows a 56% improvement rate in release quality since 2023