Update
Elon Musk Praises Claude Opus 5.5 and Predicts Grok 5 Will Outperform It
Elon Musk, in a reply on Twitter, praised Anthropic's Claude Opus 5.5 as a 'masterpiece' and admitted that his own Grok 4.8 won't match it. He predicted that Grok 5, a next-generation model, could surpass Opus 5.5 in two or three months. The update also mentioned that Grok 4.8 is currently undergoing reinforcement learning and supervised fine-tuning data cleanup, with the team moving away from JAX and SGLang in favor of a new inference and reinforcement-learning system written in C and C++.