GPT-3.5 is when LLMs start to get "main stream". That's about 4.5 months before the GPT-4 release.

Keep in mind GPT-3.5 is not an overnight craze. It takes months before normal people even know what it is.

>GPT-3.5 is when LLMs start to get "main stream".

To the general public sure but not research which is what produces the models.

The idea that diminishing returns has hit because there hasn't been a new SOTA model in 9 months is ridiculous. Models take months just to train. Open AI sat on 4 for over half a year after training was done just red-teaming it.