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

https://www.bookmarking-online.win/the-ai-models-index-shows-that-new-ai-releases-are-arriving-roughly-every-4-5

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