xAI’s Grok 5 remains in active training on the massive Colossus 2 supercluster as of late May 2026, with no public release or official launch announcement yet. The model’s reported scale—targeting 6–10 trillion parameters in a Mixture-of-Experts architecture—requires extensive post-training alignment and safety work after pre-training completes, contributing to the market’s modest implied probability of availability to the general public by the June 30 deadline. Recent emphasis has instead fallen on rapid iteration of the Grok 4 series, including the April release of Grok 4.3 beta and Elon Musk’s statements projecting Grok 4.4 and 4.5 in May, alongside new coding-agent integrations such as Grok Build. Staff departures from the pre-training team since the SpaceXAI restructuring add further uncertainty around execution timelines.