Elon Musk just revealed a massive update on Grok 4.8, and SpaceXSI has completely rebuilt its reinforcement learning and inference infrastructure from scratch The engineering team has abandoned JAX and SGLang, rewriting the entire RL and inference stack in C/C++ Here’s where Grok 4.8 stands: • Pre-training is complete • Major cleanup of supervised fine-tuning data • Reinforcement learning now underway • Evaluation scores are starting to climb • Soft rollout to Grok Bot users planned for later this week And Elon also gave another imp update about Grok 4.8: “Grok 4.8 will bear no resemblance to 4.7 (thankfully)” He also explained why the development took longer than expected: “It is not yet incredible, but, this time, the foundations are built right, so I expect it to evolve to be something special” This is a fundamental engineering overhaul, not just another model upgrade SpaceXSI has rewritten the underlying infrastructure to build a much stronger foundation for Grok’s future development. And the first Grok Bot users are expected to get their hands on it this week