Musk: Grok 4.8 Pre-training Completed, Limited Rollout This Week

Grok 4.8 has completed pre-training and is currently entering the reinforcement learning phase, with evaluation scores on the rise. xAI plans to conduct a limited rollout to Bot users later this week. Musk stated that the team has abandoned JAX/SGLang and is rewriting the reinforcement learning and reasoning systems from scratch using C/C++, which is one of the reasons for the delay. At the same time, a significant amount of cleaning has been done on the supervised fine-tuning data. Musk claimed that Grok 4.8 is completely different from 4.7; although it cannot yet be described as excellent, the underlying foundation has been established.

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