The AI Models Index tracks premium model releases from 15 top labs since 2023,...

https://elliottkykp923.yousher.com/why-does-gpt-5-2-cost-more-than-gpt-5-1

The AI Models Index tracks premium model releases from 15 top labs since 2023, with verified dates and blind-vote checks to ensure accuracy. Updated every two weeks, it shows that the average release cycle has sped up to just 4.5 days—a 56% improvement