The AI Models Index helps you see what changed between model releases before...

https://zandersexcellentblog.quillnesty.com/posts/what-is-openai-s-expected-next-premium-release-window-in-the-timeline

The AI Models Index helps you see what changed between model releases before you upgrade. It tracks 178 releases, with verified public release dates and blind-vote checks that compare models without revealing their names