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

https://holdensimpressivethoughts.lumenforgex.com/posts/why-did-gpt-6.1-sol-improve-after-gpt-6-sol-regressed

The AI Models Index keeps you up to date on premium AI releases from 15 labs since 2023, verifying launch dates and using blind-vote checks to ensure accuracy. Updated biweekly, it tracks improvements like the 56% faster performance seen in GPT-5