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Jan 6, 2026

xAI Raises $20B Series E

xAI is rapidly accelerating its progress in building advanced AI.

xAI completed its upsized Series E funding round, exceeding the $15 billion targeted round size, and raised $20 billion. Investors participating in the round include Valor Equity Partners, Stepstone Group, Fidelity Management & Research Company, Qatar Investment Authority, MGX and Baron Capital Group, amongst other key partners. Strategic investors in the round include NVIDIA and Cisco Investments, who continue to support xAI in rapidly scaling our compute infrastructure and buildout of the largest GPU clusters in the world.

2025 was a year of breakthrough momentum, where the xAI team advanced a multitude of key initiatives including:

  • Data Centers: xAI continues to expand its decisive compute advantage with the world's largest AI supercomputers at Colossus I and II, ending the year with over one million H100 GPU equivalents.
  • Grok 4 Series: our frontier language models are built on the best-in-class training infrastructure powered by Colossus. xAI has pushed reinforcement learning training to unprecedented levels, refining Grok’s intelligence, reasoning, and agency using pretraining-scale compute.
  • Grok Voice: the most intelligent voice agent driving real-time conversations in voice mode and available via agent API. Grok Voice delivers low-latency speech in dozens of languages, tool calling, and real-time data access, serving millions of users across the Grok mobile app and in Tesla vehicles.
  • User metrics: our reach spans approximately 600 million monthly active users across the 𝕏 and Grok apps.
  • Grok Imagine: our lightning-fast image and video generation models that brings state-of-the-art multimodal understanding, editing, and generation capabilities.
  • Grok on 𝕏: leveraging the 𝕏 platform to understand what's happening in the world in real-time, utilizing xAI’s most powerful model to date.

Looking ahead, Grok 5 is currently in training, and we are focused on launching innovative new consumer and enterprise products that harness the power of Grok, Colossus, and 𝕏 to transform how we live, work, and play.

This financing will accelerate our world-leading infrastructure buildout, enable the rapid development and deployment of transformative AI products reaching billions of users, and fuel groundbreaking research advancing xAI's core mission: Understanding the Universe.

xAI is hiring aggressively and seeks mission-oriented individuals ready to join a small team focused on making a transformational impact on the future of humanity. Those interested can apply today at x.ai/careers.