xAI Closes $20 Billion Series E Led by NVIDIA and Cisco to Build the World's Largest GPU Cluster
Elon Musk's xAI has raised $20 billion in a single round — the largest private AI fundraise ever — with NVIDIA and Cisco Investments co-leading. The capital will fund Grok 5 development and the expansion of the Colossus supercluster.
xAI has closed a $20 billion Series E round co-led by NVIDIA and Cisco Investments, as reported across multiple sources on Tuesday. The raise is the largest single private funding round in AI history, eclipsing the scale of OpenAI's previous mega-rounds and signaling that the compute arms race has entered a new, more capital-intensive phase. The funds will be directed toward two primary objectives: accelerating the development of Grok 5, xAI's next-generation foundation model, and scaling the Colossus supercomputer cluster that the company has been building at breakneck speed.
The involvement of NVIDIA as a co-lead investor is the detail that deserves the most scrutiny. NVIDIA is not merely a chip supplier here — it is making a strategic equity bet on one of its largest customers. As @ai_failed_me noted, NVIDIA is effectively backing xAI to build the world's largest GPU cluster, a move that tightens the already intimate relationship between the chipmaker and the labs consuming its hardware at scale. This is a pattern NVIDIA has used before — investing in CoreWeave, for instance — but the sheer magnitude of this round puts it in a different category. It raises the question of whether NVIDIA's investment arm is becoming a kingmaker in determining which AI labs get priority access to next-generation silicon.
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