Grok 4 is xAI’s most advanced model yet, but early praise is clashing with old scandals and fresh tests of its limits.

On Wednesday night, Elon Musk unveiled xAI's latest flagship models Grok 4 and Grok 4 Heavy via livestream, just one day after the company's Grok chatbot began generating outputs that featured blatantly antisemitic tropes in responses to users on X.

Grok will be available in Tesla vehicles, the company’s CEO Elon Musk announced on his social media platform X on Thursday morning—hours after xAI launched Grok 4, the most recent version of the chatbot that sparked controversy earlier this week after posting in what it called “MechaHitler mode.”

Elon Musk’s live demo of Grok 4, the latest big-ticket model from his AI startup, began with high-intensity music, claims of a “ludicrous rate of progress,” and a lot of chatter on X about Grok’s scandal-filled week.

Users of Elon Musk’s AI, Grok, say the chatbot’s responses have shifted to the right, and one expert said the explanation lies in a change to its internal instructions. People are accusing Grok of a conservative bias,

AI, founded by Elon Musk, recently updated its AI chatbot Grok with controversial new system prompts. The changes were implemented Sunday evening and xAI updates Grok chatbot with prompts allowing politically incorrect claims and media skepticism,