xAI has launched the new Grok 4 and Grok 4 Heavy AI models Grok 4 requires a $30 monthly SuperGrok subscription The launch comes as Grok faces renewed criticism xAI introduced new versions of its Grok AI model line. Grok 4 and its larger, more powerful sibling, Grok 4 Heavy, are part of CEO Elon Musk’s effort to position Grok as a serious competitor to OpenAI’s ChatGPT, Google’s Gemini, and Anthropic’s Claude. That includes the new $300-a-month subscription tier called SuperGrok Heavy, which offers exclusive access to Grok 4 Heavy. Musk boasted during the announcement livestream that “Grok 4 is...