https://techcrunch.com/2023/11/03/musk-says-twitter-subscribers-will-get-early-access-to-xais-chatbot-grok/

Elon Musk’s AI startup, xAI, is creating its own version of ChatGPT.

That appears to be the case, at least, from Musk’s tweets on X late Friday evening teasing the AI model xAI has been quietly developing. Called Grok — a name xAI trademarked recently — the model answers questions conversationally, possibly drawing on a knowledge base similar to that used to train ChatGPT and other comparable text-generating models (e.g. Meta’s Llama 2).