Meta Platforms' approximately $1.81 trillion market capitalization underpins the 93% trader-implied probability it will exceed OpenAI's valuation by December 31, 2026. Meta's public equity trades with transparent pricing, supported by $228 billion in trailing revenue, strong free cash flow, and ongoing AI infrastructure investments exceeding $100 billion annually. OpenAI's latest confirmed post-money valuation stands at $852 billion from its March 2026 round, with unconfirmed talks of a $1.4 trillion pre-money financing still leaving it well below Meta even if completed. Revenue run rates near $50 billion, targeting $70 billion by year-end, reflect rapid growth but also highlight the scale gap and execution risks within the brief remaining window. A breakthrough funding round or IPO filing could narrow the difference, though such catalysts face timing and regulatory hurdles before resolution.