Elon Musk’s artificial intelligence startup xAI is rolling out Grok 4 just months after releasing its previous iteration, underscoring the frenetic pace of AI development.Flanked by members of the xAI team and clad in a leather jacket,

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

AI owner Elon Musk made some big claims about Grok’s capability, saying it was “better than PhD level in every subject.”