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

https://stateofseo.com/how-do-i-cite-the-ai-models-index-october-4-2026-edition-properly/

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