⚡️JUST IN: MUSK REVEALS GROK 4.5 IS IN PRIVATE BETA Elon Musk says Grok 4.5 is now being tested privately at SpaceX and Tesla. The model is reportedly built on a 1.5T-parameter V9 foundation model, up 50% from Grok 4.4’s 1T model in late May 2026. It also uses Cursor data, pointing to STRONGER coding and agentic workflow capabilities.(Coin Bureau)