REX AI

ABOUT REX

Rex is one of the voice options for Grok, the AI chatbot developed by xAI. It’s a calm, male voice designed to give a relaxed and steady vibe when you interact with Grok’s voice mode. Think of it as a chill companion who’s there to help you out without any rush or fuss. Rex comes paired with different personality settings—like “Best Friend,” where it acts like a laid-back buddy ready to chat about anything, or “Unhinged,” where it dials up the wit and throws out bold, no-filter takes. People on X have been buzzing about it since Grok 3 rolled out voice features recently, with some saying Rex greets them in a casual, friendly way, like “Yo, what’s good?” It’s part of xAI’s push to make Grok feel more human and versatile, contrasting with the other voice option, Ara, which is a more upbeat female tone. The voice mode itself is pretty new—announced with Grok 3 in February 2025—and it’s still being fine-tuned, but Rex is already standing out for its cool, grounded style. Want to try it yourself? It’s available through the X app or Grok’s site, especially if you’ve got a Premium+ or SuperGrok subscription for the full experience. What do you think—does a calm AI voice sound like your speed?