xAI Grok 4 Fast AI significantly reduces costs while retaining high performance in answering prompts

xAI has released Grok 4 Fast, its latest artificial intelligence large-language model providing high performance in answering text prompts, with the ability to search the web to complete its tasks.

The AI has been optimized to use fewer units of data while answering user questions, resulting in lower costs for businesses that use the xAI API to access it. The model was tuned using large-scale reinforcement learning, allowing Grok 4 Fast to use approximately 40% fewer tokens to answer prompts than Grok 4.

Grok 4 Fast immediately ranked in the top ten most powerful AIs in the world for answering text prompts and ranked number one for searching the web to answer prompts, according to the LMArena Leaderboard. The LLM automatically switches between slower thinking (reasoning) and quicker response (non-reasoning) models integrated into its architecture, allowing it to handle complex and simple questions from its users.

Due to its focus on price versus performance, Grok 4 Fast does not have certain advanced features of the very best AI, such as image and video creation capabilities.

Readers can chat with Grok Fast 4 for free on the website and smartphone apps for Android and iOS devices and read about crafting prompts in this book on Amazon.