The data from Polymarket, the only prediction market currently offering a contract on OpenAI's IPO valuation, paints a clear picture: traders overwhelmingly expect the artificial intelligence giant to debut with a market cap above $1.25 trillion. With $208,000 in volume riding on the outcome, the 82% probability reflects a strong consensus that OpenAI's public offering will command a valuation exceeding the upper bound of the specified range.
No other major platforms—Kalshi or Manifold—have listed contracts for this specific event, limiting cross-platform comparison. The absence of competing data points means the Polymarket figure stands as the sole market-based signal, though it carries the weight of significant liquidity. No specific external trigger was identified in today's news flow to explain the current odds, suggesting the probability reflects a steady, long-term view of OpenAI's growth trajectory and market appetite for AI stocks.
The 18% probability for a $1 trillion to $1.25 trillion range indicates that while a lower valuation is not impossible, traders see it as a distinct minority outcome. This expectation aligns with broader industry sentiment around OpenAI's dominant position in generative AI and its potential to attract massive investor demand upon going public.