Grok 4 Fast is a new model from xAI built for speed and efficiency while keeping strong reasoning ability. It uses fewer tokens, making it cheaper to run, yet still handles a wide range of tasks. With a massive two-million-token context window, it can process very long conversations or documents in one go. The model combines reasoning and non-reasoning modes into a single system, adjusting automatically to the complexity of the task. It also connects to the web and X for real-time information, positioning it as both powerful and practical for everyday use.
In academic partnership with Virscend University, a WASC-accredited institution in Irvine, California.