Elon Musk’s xAI has launched Grok-4-Fast, a new flagship AI model the company claims delivers state-of-the-art performance with breakthrough cost efficiency. This positions Grok-4-Fast as a powerful yet accessible tool for developers and consumers in the competitive AI landscape. A New Model Focused on ‘Intelligence Density’At the core of Grok-4-Fast is a strategic focus on what xAI calls “intelligence density”—delivering maximum performance at the minimum possible cost. For developers, xAI is rolling out the model via its API with two distinct versions: `grok-4-fast-reasoning` and `grok-4-fast-non-reasoning`. xAI has also committed to an iterative development cycle, promising to continuously ship model improvements based on user feedback gathered from X.com.