Elon Musk’s xAI Launches Grok 4 with $300 Monthly Subscription

xAI Launches Grok 4

Elon Musk’s AI company, xAI, has released its latest flagship AI model, Grok 4, and unveiled a new $300-per-month AI subscription plan, SuperGrok Heavy. Grok is xAI’s answer to models like OpenAI’s ChatGPT and Google’s Gemini, and can analyze images and respond to questions.

In recent months, Grok has become more deeply integrated into Musk’s social network, X, which was recently acquired by xAI. However, that has also put Grok’s misbehavior front and center for millions of users.

The expectations are high for Grok 4. The latest AI model from xAI will be stacked up against OpenAI’s forthcoming AI model, GPT-5, which is expected to launch later this summer.

Grok 4 Performance

xAI claims that Grok 4 shows frontier level performance on several benchmarks, including Humanity’s Last Exam— a challenging test measuring AI’s ability to answer thousands of crowdsourced questions on subjects like math, humanities, and natural science.

According to xAI, Grok 4 scored 25.4% on Humanity’s Last Exam without “tools,” outperforming Google’s Gemini 2.5 Pro, which scored 21.6%, and OpenAI’s o3 (high), which scored 21%.

SuperGrok Heavy Subscription

Alongside Grok 4 and Grok 4 Heavy, xAI launched its most expensive AI subscription plan yet, a $300-per-month subscription called SuperGrok Heavy. Subscribers to the plan will get an early preview to Grok 4 Heavy, as well as early access to new features.