xAI

Timeline

1. Jan 6, 2026xAI

   Funding

   ★ Landmark

   xAI raises $20B Series E

   The largest private AI round at the time, at a $230B valuation, backed by Nvidia.

2. Jul 10, 2025xAI

   Model

   ★ Landmark

   Grok 4

   Grok 4 Heavy became the first model to exceed 50% on Humanity's Last Exam.

3. Jul 1, 2025xAI

   Funding

   xAI raises $10B

   $5B debt plus $5B equity to fund the Colossus GPU expansion.

4. Mar 28, 2025xAI

   Product

   xAI acquires X

   An all-stock merger combining the social network's data with xAI's model development.

5. Feb 17, 2025xAI

   Model

   ★ Landmark

   Grok 3

   Frontier flagship on the 200k-GPU Colossus cluster, with DeepSearch and Think Mode.