Meta's market capitalization stands near $1.85 trillion as of early October 2026, supported by robust quarterly revenue exceeding $60 billion, strong profitability, and consistent earnings growth tied to advertising and AI infrastructure investments. In contrast, OpenAI's most recent post-money valuation reached $852 billion following its March funding round, with ongoing discussions for a potential $30 billion-plus pre-IPO round at roughly $1.4 trillion pre-money amid a revenue run rate approaching $70 billion annualized. Trader consensus heavily favors Meta on December 31 due to the substantial valuation gap, OpenAI's private status limiting mark-to-market adjustments, and its ongoing heavy losses and capital requirements despite rapid top-line expansion. A material challenge could arise only if OpenAI closes an outsized funding round or experiences an unexpected surge in secondary trading values that narrows or reverses the differential before year-end.