xAI Launches Grok 4: Powerful AI Model Trained on Colossus Supercomputer Surpasses PhD Level in All Subjects

xAI has officially launched Grok 4, its most powerful AI model to date. The announcement came during a one-hour livestream event on the X platform, where Elon Musk provided an in-depth overview of the model’s capabilities. Grok 4 is positioned to compete with Google’s Gemini 2.5 Pro and OpenAI’s upcoming GPT-5 model, which is anticipated to launch later this summer. Trained on xAI’s Colossus supercomputer, Grok 4 benefits from significantly expanded training data compared to earlier versions and an unprecedented scale of reinforcement learning compute. During the livestream, Musk emphatically stated, “With respect to academic questions, Grok 4 outperforms PhD level in every subject, no exceptions.” He also noted that we are entering a new era of AI—what he termed “Big Bang Intelligence.” Grok 4 comes in two main versions, each tailored to specific tasks and user needs: Grok 4 General: Designed for a broad range of applications, from everyday queries to advanced problem-solving. Grok 4 Heavy: Built for demanding, multi-agent reasoning tasks and optimized for professional or specialized use cases. The launch of Grok 4 underscores xAI’s growing role in the AI race, showcasing its ambition to challenge industry leaders and contribute to the next frontier of artificial intelligence.