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 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 ...

XAI just released Grok 4.1 Fast. It is fast model that is leading AI agent ranking. It has real-time X data, web browsing, and code tools. Elon Musk says Grok 4.20 should release by Xmas. It will ...

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 ...