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

https://connersinterestingblog.theglensecret.com/why-do-fast-follow-up-releases-under-45-days-disappoint-so-often

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