Tesla CEO Elon Musk: GROK 4.8 is a 2.5T model trained using our new C++ software stack, and the model will complete training and begin reinforcement learning this week.

2026-09-14

Tesla CEO Elon Musk: GROK 4.8 is a 2.5T model trained using our new C++ software stack, and the model will complete training and begin reinforcement learning this week.