Elon Musk’s artificial intelligence company xAI has unveiled two new flagship models, the Grok 4 and Grok 4 Heavy, that are set to compete with OpenAI’s upcoming GPT-5. It has also introduced a $300 monthly subscription, TechCrunch reports.
"With respect to academic questions, Grok 4 is better than PhD level in every subject, no exceptions. At times, it may lack common sense, and it has not yet invented new technologies or discovered new physics, but that is just a matter of time," Elon Musk said during the presentation.
xAI claims that Grok 4 has superior performance in several tests, including Humanity's Last Exam, which measures the ability of an AI to answer thousands of questions in math, humanities, and science. According to the graph provided, Grok 4 scored 25.4% on the test, beating Google's Gemini 2.5 Pro and OpenAI's o3.
The second model introduced, the Grok 4 Heavy, is even more powerful. According to Musk, the Heavy launches multiple agents to work on a problem simultaneously, and then they all compare their work "like a training group" to find the best answer.
Along with the two models, xAI is also introducing a SuperGrok Heavy subscription plan, which will cost $300 per month. Subscribers will get early access to Grok 4 Heavy, as well as future new features and products the company will introduce. While Musk isn’t the first to introduce an AI subscription, his offering is the most expensive yet, beating out offerings from OpenAI, Google, Anthropic, and others.
For now, xAI says it will release an AI model for coding in August, a multimodal agent in September, and a video generation model in October. The already-released Grok 4 will also be available via API to attract developers to build apps, but only time will tell whether anyone will need a model praising Hitler.