The AI Models Index shows that in 2026, new models are released every 4.5 days...

https://wiki-square.win/index.php/What_Counts_as_%22Public_Use%22_for_an_AI_Model_Release_Date%3F

The AI Models Index shows that in 2026, new models are released every 4.5 days on average. While 56% of these updates bring measurable improvements, about 16% actually cause regressions. The median gain in LMArena scores is +9