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

https://holdenssplendiddigests.zenbloomer.com/posts/why-did-gpt-6.1-sol-improve-after-gpt-6-sol-regressed

The AI Models Index shows that in 2026, new AI models are launching every 4.5 days on average. While 56% of these updates improve performance, about 16% actually cause regressions. Overall, median gains on LMArena benchmarks hit +9