Meta’s current market capitalization near $1.89 trillion, backed by $228 billion in trailing revenue and robust free cash flow, far exceeds OpenAI’s latest confirmed $852 billion post-money valuation from its March 2026 round. Traders price in Meta’s scale advantages, ongoing AI infrastructure investments exceeding $100 billion annually, and public-market liquidity as durable supports for maintaining the lead through year-end. OpenAI’s revenue run rate near $50 billion—with ambitions to reach $70 billion—underpins its pursuit of a $1.4 trillion financing, yet the implied probability reflects realistic hurdles including execution risk on growth targets and the absence of a public listing before 2027. A sharp Meta share-price decline or an unexpectedly large OpenAI tender at premium terms could narrow the gap, though neither appears probable on current trajectories.