The AI Models Index keeps you up to date on premium model releases from 15...

https://oliviasinsightfulthoughts.novacrestiq.com/posts/is-openai-actually-steady-on-release-cadence-or-does-it-swing

The AI Models Index keeps you up to date on premium model releases from 15 leading labs since 2023, with verified dates and blind-vote checks. Updated every two weeks, it shows trends like a 56% faster improvement rate and tracks key updates like GPT-5