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

https://www.fastbookmarks.win/the-ai-models-index-tracks-premium-model-releases-from-15-leading-labs-since-1

The AI Models Index shows that in 2026, new models are released every 4.5 days on average. While 56% of these updates improve performance, 16% actually cause regressions. Overall, median gains on LMArena benchmarks are about +9