The AI Models Index shows that new AI releases are arriving roughly every 4.5...

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

The AI Models Index shows that new AI releases are arriving roughly every 4.5 days in 2026, reflecting a rapid pace of innovation. On average, 56% of updates bring measurable improvements, though about 16% cause regressions