Elon Musk Calls Claude Opus 5.5 a 'Masterpiece', Admits Grok 4.8 Won't Match It
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6 Articles
Elon Musk Reveals Major Grok 4.8 Overhaul as SpaceX Rebuilds AI Infrastructure From Scratch
Elon Musk has revealed a major update on Grok 4.8, offering a glimpse into the extensive engineering work taking place behind the next generation of his artificial intelligence model. Unlike a conventional model upgrade focused primarily on improving performance, Grok 4.8 represents a fundamental rebuilding of the infrastructure responsible for training, reinforcement learning and inference. […]
Elon Musk said that the team dismissed JAX and SGLang and rewrote the reinforcement and inference learning stack in C/C++ from scratch. According to its publication, pre-training has already ended, much of the SFT data has been cleaned and version 4.8 is now entering RL and evaluations. *** The rewriting of the RL stack and C/C++ inference took longer than expected, according to Musk. The pre-training ended and the team performed a data cleansin…
Elon Musk says a from-scratch C/C++ rewrite is why Grok 4.8 ran late
Grok 4.8 has finished pre-training and is in reinforcement learning on homegrown code that replaces JAX and SGLang. A soft rollout to Grok Bot users is due this week, with no benchmarks, price or model card, and Musk already ranks it below Anthropic's Opus 5.5.
According to ChainCatcher, Elon Musk stated on social media that Grok 4.8 has entered the reinforcement learning phase and is scheduled for a limited rollout to bot users later this week. Grok 4.8 has rewritten its technology stack using C/C++, and training and supervised fine-tuning are complete, with performance metrics beginning to improve.
Elon Musk announced on November 10, 2026 the end of Grok 4.8 pre-training and a gradual deployment to Grok Bot users this week. What is said, which is not.
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