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

Elon Musk's AI chatbot, Grok, was recently upgraded — and soon thereafter, unleashed a string of antisemitic posts on X and branded itself "mecha-Hitler." The chatbot was eventually shut down, but now,

We are aware of posts made by Grok and are actively working to remove the inappropriate posts,” Musk's company said.