On July 10 at noon, Beijing time, Musk's AI venture, xAI, unveiled the highly anticipated Grok-4 series model, although the event was delayed by an hour from its initial schedule. During the live stream, Musk hailed it as the "premier AI in the world" and showcased its capabilities. Nonetheless, some observers felt that the presentation lacked sophistication, and a few even noted Musk's visible fatigue. The Grok-4 series comprises two versions: Grok 4 and Grok 4 Heavy, both dedicated to pure reasoning. Grok 4 operates as a single-agent model, whereas Grok 4 Heavy facilitates multiple agents working concurrently. This release signifies another major milestone for xAI in the realm of artificial intelligence.