Elon Musk's SpaceX has committed $2 billion to his artificial intelligence startup xAI as part of a $5 billion equity round, the Wall Street Journal reported. The investment follows xAI's merger with X (formerly Twitter) and values the combined company at $113 billion. Meanwhile, Musk has released xAI's Grok 4, which integrates real-time data from X, Tesla and SpaceX.