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

https://riversexpertchat.cloudhinter.com/posts/what-win-rate-counts-as-a-real-step-vs-a-big-step-in-ai-model-progress

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