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

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 tracks premium model releases from 15 top labs since 2023, with verified launch dates and blind-vote quality checks. Updated biweekly, it shows the pace of innovation—like a 56% improvement rate between GPT-5.1 and GPT-5.2