The AI Models Index shows that in 2026, new AI models are released roughly...

https://wiki-spirit.win/index.php/How_Can_I_Track_API_Release_Dates_for_OpenAI_Models%3F

The AI Models Index shows that in 2026, new AI models are released roughly every 4.5 days. Among these, 56% demonstrate improvements, while 16% show some regression. On average, models gain a median 9