SpaceXSI

Major social media advertising platform and frontier AI model provider, operating under SpaceX ownership with deep integration between Grok AI and the X social network

SpaceXSI, legally SpaceX Super Intelligence LLC, is the AI and social media arm of SpaceX. Originally founded as xAI by Elon Musk in 2023, the entity was rebranded to SpaceXAI in mid-2026 and then to SpaceXSI in October 2026 following SpaceX's acquisition of the business on February 2, 2026. The company develops the Grok family of large language models and owns and operates X (formerly Twitter), the global social media platform. X is a major player in digital advertising, offering brands access to a large global audience through promoted posts, video ads, and targeted display formats. Advertisers can reach users across X's timeline, search results, and profile pages, with targeting options spanning interests, demographics, keywords, and follower look-alikes. The platform competes directly with Meta, Google, Snap, and TikTok for social and performance advertising budgets, and Grok AI is increasingly integrated into X's ad products and user experience. As a unit of SpaceX, SpaceXSI combines frontier AI research with a scaled consumer social network, giving it a distinctive position at the intersection of AI infrastructure and social media advertising. Grok models power features across X and are available via API to enterprise developers, while X's advertising platform serves brands ranging from global enterprises to small businesses seeking social media reach.