The latest AI Models Index shows a release pace of one model every 4.5 days,...

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

The latest AI Models Index shows a release pace of one model every 4.5 days, highlighting the rapid evolution in 2026. While 56% of updates bring measurable improvements, 16% cause performance setbacks. Median gains on LMArena sit at +9