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

https://iris-wiki.win/index.php/What_Happened_with_GPT-6_Sol_vs_GPT-6.1_Sol_in_Blind_Votes%3F

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