Grok 5 slips to Q2 2026 — 6T-parameter MoE training on Colossus 2

xAI delayed Grok 5 from Q1 to Q2 2026. The model is reportedly a 6-trillion-parameter Mixture-of-Experts running on the 1GW Colossus 2 supercluster in Memphis. Grok 4.20 Beta 2 remains the public model; SpaceX's February acquisition of xAI valued the combined entity at $1.25T.