Elon Musk said in a post on X that xAI will make Grok 4.5 available to the public "tomorrow" after what he described as strong customer feedback in a beta program. He also framed the model as "Opus-class," while claiming it is faster, more token-efficient and lower cost. So far, the only public sourcing in the supplied material is Musk's own announcement and reaction around it on X.