Musk Says xAI's C/C++ Training Stack Is Still Human-Written

Musk revealed xAI's pre-training software now runs on an in-house C/C++ stack built by the Starlink team, calling it possibly the industry's best, while noting the RL stack remains a legacy mess and AI isn't yet capable of writing such performance-critical code.

2026-09-14 ~ 2026-09-15 · 2 related posts

• Musk: xAI's pretraining runs on in-house C/C++ stack, RL stack still legacy mess — jsuarez · 2026-09-14
• Musk: xAI's C/C++ training stack was written by humans — AI not yet good enough — Fowe · 2026-09-15