“Grok 4 Heavy for the toughest problems. And it gets better almost every week. [@tetsuoai] Grok 4 Heavy is a version of Grok 4 that uses multiple agents. Instead of relying on just one model, agents work together simultaneously on the same task. After they produce their results, they compare their findings and agree on a final answer. In Humanity's Last Exam, Grok 4”