Musk says 2.5T-parameter Grok 4.8, trained on new C++ stack, finishes training this week
inductionheads · x · 2026-09-14
Elon Musk revealed that Grok 4.8 is a 2.5T-parameter model trained with xAI's new C++ software stack. Training finishes this week, after which the model will enter the RL stage. If accurate, it would be among the largest known models by parameter count, and the C++ training stack marks an unusual technical choice.
Related event: Musk Says 2.5T-Parameter Grok 4.8 Finishes Pretraining This Week(3 posts)→
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