June Report on the US AI Market: Grok's Market Share Drops to Fifth Place, Meta AI Enters the Top Four for the First Time, and ChatGPT Rebounds Amidst Underlying Concerns

According to the latest data briefing released by mobile app analytics firm Apptopia, the market share of Grok, a mobile app under SpaceX (SPCX.US), continues to decline in the US, while Meta (META.US) AI has climbed to fourth place for the first time. Meanwhile, a significant user behavior trend has emerged: in the second quarter of 2026, 86% of US users used only one AI chatbot, indicating a marked increase in user loyalty.