According to xAI's data, Grok 4 and Grok 4 Heavy essentially beat all other models, including OpenAI's o3, Google's Gemini 2.5 Pro, and Claude 4 Opus in various common AI benchmarks, though as one Redditor noticed, the competitors have been chosen selectively, likely to make Grok look better.

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

Some X users suddenly became the subject of violent ideations by xAI’s flagship chatbot.

The release comes months after the AI startup launched its previous iteration, suggesting an ongoing lightning pace of AI development.