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

https://sierra-wiki.win/index.php/How_Many_2026_Premium_Releases_Were_Point_Releases_vs_New_Generations%3F

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