xAI

Timeline

1. Sep 21, 2026xAI

   Model

   Grok 4.7

   SpaceXAI's new frontier coding and agent model; its Fast variant is exclusive to Cursor and Grok Build.

2. Aug 12, 2026xAI

   Model

   Grok 4.6

   Extended Grok's agent focus with a 500K-token context window and image input.

3. Jul 8, 2026xAI

   Model

   Grok 4.5

   SpaceXAI's model for coding, agents and knowledge work at $2 / $6 per million tokens.

4. 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.

5. Jul 10, 2025xAI

   Model

   ★ Landmark

   Grok 4

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

6. Jul 1, 2025xAI

   Funding

   xAI raises $10B

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

7. Mar 28, 2025xAI

   Product

   xAI acquires X

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

8. Feb 17, 2025xAI

   Model

   ★ Landmark

   Grok 3

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