ChatGPT. I was under the impression ChatGPT was now running with GPT-4? But if not, then I stand mistaken.
An email from OpenAI 2 days ago said that GPT4 is on the paid ChatGPT Plus plan, and "severely resource constrained" with a dynamically adjusted usage cap based on availability.
Seems like for today, if you're not sure if you're using GPT4, you're not.