PALO ALTO, Calif. — xAI raises $20 billion in an upsized Series E funding round, Elon Musk’s artificial intelligence company said Tuesday. The company said the proceeds will speed infrastructure expansion and support training for its next flagship model, Grok 5, with Nvidia and Cisco Investments joining as strategic backers, Jan. 6, 2026.
In its Series E announcement, xAI said the round exceeded a $15 billion target and drew investors including Valor Equity Partners, StepStone Group, Fidelity Management & Research Co., Qatar Investment Authority, MGX and Baron Capital Group.
Reuters reported that xAI said Nvidia and Cisco Investments’ participation would help expand computing capacity as it races to close the gap with OpenAI’s ChatGPT and Alphabet’s Gemini. Contacted for comment, xAI replied by email with the message, “Legacy Media Lies.”
xAI raises $20 billion to push Grok 5 training and scale compute
xAI said Grok 5 is “currently in training” and framed the financing as fuel to “accelerate our world-leading infrastructure buildout,” along with new product development and research. The company did not disclose whether Nvidia and Cisco’s contributions were equity, debt or another structure; TechCrunch noted that xAI has not specified the form of those strategic investments.
xAI also offered a snapshot of the scale it says it is already operating. The company said it ended 2025 with more than 1 million H100 GPU equivalents across its Colossus I and II supercomputers and that its reach spans about 600 million monthly active users across X and the Grok apps. Business Insider reported that xAI is leaning on those metrics to pitch a “compute advantage” as it prepares additional consumer and enterprise offerings.
Build: More data-center capacity and larger GPU clusters.
Train: Continued development of Grok models, including Grok 5.
Ship: New consumer and enterprise products, plus longer-term research.
Even with xAI raises $20 billion, the spending is likely to be front-loaded. Frontier-model training depends on scarce accelerators, high-bandwidth networking, and power-hungry facilities that can take months to build and scale. Nvidia’s dual role as chip supplier and strategic investor underscores how tightly capital, chips and model road maps are now intertwined.
The buildup to Series E
The new round follows a fast-moving timeline that has tracked xAI’s push to lock in compute and distribution. In May 2024, Reuters reported that Musk told investors xAI planned a Grok-focused supercomputer and floated a potential partnership with Oracle to build it. By late 2024, TechCrunch reported xAI’s $6 billion Series C, which it said valued the company at about $45 billion at the time. In March 2025, Reuters detailed xAI’s all-stock acquisition of X, which Musk said combined “data, models, compute, distribution and talent.” Then, in July 2025, DataCenterDynamics reported a $10 billion debt-and-equity package tied in part to expanding data-center capacity in Memphis, Tennessee.
The Series E extends that arc — and underscores why xAI raises $20 billion is being read as a compute-and-capital bet as much as a model-development milestone. For the broader market, xAI raises $20 billion is another sign that the AI boom remains anchored in infrastructure: whoever can buy, power and network the most compute may be best positioned to ship the next breakout model.
