GPT-3 was released in 2020. GPT-3.5 in late 2022. GPT-4 in early 2023, and that's basically it for me. Granted, they introduced the 4o model later that has some nice features while being quite well behind their top model (now called by them "legacy"). In the meantime, Claude 3.5 became dangerously close while having a much better context window than what AI offers.

So since March 2023 we haven't seen any increase in quality on their part. They need to "leak" things to keep market interest in them.