Elon Musk's frontier generative AI startup xAI formally opened developer access to its Grok 4.1 Fast models last night and introduced a new Agent Tools API—but the technical milestones were ...

Elon Musk’s xAI has launched Grok 4 Fast, its newest artificial intelligence model that boasts high-level reasoning at significantly lower costs. xAI announced the launch of Grok 4 Fast in a blog post ...

With all the AI news coming out each week, some of the more significant advancements can be hard to track. Grok 4 Fast is streamlined version of xAI's flagship Grok 4 model released back in July 2025.

Elon Musk's generative artificial intelligence company xAI unveiled its new reasoning model late on Friday, known as Grok 4 Fast. “We used large-scale reinforcement learning to maximize the ...