The prediction market for OpenAI's IPO valuation is sparse but decisive. On Polymarket, the sole platform tracking this event, traders have placed $198,000 in bets, with a mere 3% chance that the company's market cap lands between $1 trillion and $1.25 trillion at the close of its first trading day. This implies a 97% expectation that the valuation will either fall below $1 trillion or exceed $1.25 trillion, though the specific breakdown within that 97% is not directly captured by this market.
Without data from Kalshi or Manifold, the picture relies entirely on Polymarket's liquidity, which is modest but not negligible. The absence of competing platforms limits cross-validation, but the overwhelming consensus among active traders is clear: OpenAI is not expected to debut as a trillion-dollar-plus entity. No specific external trigger, such as recent earnings reports or regulatory developments, has been identified in today's news flow to explain this sentiment.
The market's focus on the $1T to $1.25T band suggests that traders see a narrow window for a high valuation, but the odds are heavily stacked against it. This could reflect skepticism about OpenAI's near-term revenue growth, competitive pressures from rivals like Google and Anthropic, or the broader tech IPO climate. As the 2026 resolution date approaches, shifts in company disclosures or market conditions could alter these probabilities.