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

https://riversexpertchat.cloudhinter.com/posts/what-happened-to-gpt-5-vs-gpt-4.5-lead-over-time

The AI Models Index tracks premium releases from 15 labs since 2023, showing verified dates and blind-vote checks every two weeks. On average, new models like GPT-5.2 arrive every 4.5 days—a 56% faster pace than before