“Grok is coming to Tesla vehicles very soon. Next week at the latest,” Elon Musk stated Thursday in a post on X. It's also unclear if Tesla owners will have to pay for Grok access in their EVs, or how much it might cost. And access to a more capable version known as Grok 4 Heavy will cost considerably more, $300 per month. Of course, should Tesla owners not wish to use Musk's Grok in their Teslas, they will have other in-car options, thanks to the brand's web browser.