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

https://deansinspiringperspective.hexaforgey.com/posts/did-gpt-5.2-actually-regress-in-chat-quality

The AI Models Index shows that in 2026, new AI models are being released every 4.5 days on average. While 56% of these updates bring improvements, about 16% actually cause performance regressions. Overall, models gained a median +9