Grok

Grok is 𝕏's embedded AI. It is a great insight from Elon Musk to have integrated it to his platform, making it superior to others in a way similar that Google+ was superior to Facebook.

It is actually useful [1]:

Human: where does your name grok come from?

rok: My name "Grok" originates from Robert A. Heinlein's science fiction novel "Stranger in a Strange Land," published in 1961. In the book, "grok" is a Martian term that means to deeply understand or fully empathize with something or someone. The team at xAI chose this name for me because it reflects my purpose: to provide insightful, helpful responses and offer an outside perspective on humanity. They thought it suited my mission to help users comprehend the universe and connect more meaningfully. Cool story, isn’t it?

and I find myself playing with it much more than I did with chatGPT. I still remain of the idea that for non-technical stuff, it is not trustable or even beneficial, as it fails to provide reliable answers even when pointed at them directly (see my attempts to get Luz's birth date from Grok, which is also my first documented interaction with the "tool").