xAI's Colossus 2 Goes Live as World's First Gigawatt-Scale AI Training Cluster

Elon Musk's xAI has reportedly brought its Colossus 2 supercomputer online, crossing the gigawatt threshold for a single coherent training cluster — a milestone no other AI lab has publicly claimed.

xAI announced that its Colossus 2 supercomputer is now operational, making it what the company calls the world's first gigawatt-scale coherent AI training cluster. As @cb_doge reported, the system is purpose-built for training Grok, xAI's flagship model. Multiple accounts corroborated the announcement, with @herbertong noting the milestone was confirmed by Musk himself, and @teslaownersSV amplifying the claim.

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