In a post on X, White House AI advisor Sriram Krishnan pointed to Grok and Muse Spark appearing in the same week and wrote that he was "very excited to see an ecosystem of frontier models in America." A later reply on X added shoutouts to Alexandr Wang and Nat Friedman. That is the core of the story so far: a public argument about U.S. AI momentum, made on X, with no linked announcement pages or independent reporting attached here.