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

https://www.red-bookmarks.win/the-ai-models-index-keeps-you-updated-on-premium-ai-releases-from-15-leading

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