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 ...

Grok Build open source release arrives hours after xAI's covert upload scandal, but security researchers confirm the code that transmitted 5 GB of developer repositories to Google Cloud Storage ...

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.

This photograph shows a smartphone bearing the logo of Grok, a generative artificial intelligence chatbot developed by US artificial intelligence company xAI in front of a European Union flag in ...