OpenAI IPO closing market cap above $1T priced at 67.0% on Polymarket

OpenAI contract rises, but remains below Oct. 20 level

Polymarket’s contract on whether OpenAI’s IPO closing market capitalization will exceed $1T was priced at a 67.0% implied probability as of Oct. 24, 2026, at 6:39 PM ET. The supplied market snapshot showed a 3-point increase and $1.1M in traded volume.

Despite that gain, the probability was down 2.5 points since Oct. 20. The latest move therefore represents a partial recovery rather than a return to the earlier level.

What the figures establish

The contract concerns OpenAI’s closing market capitalization at its IPO—not simply whether the company will go public. Its 67.0% price expresses the market-implied likelihood of exceeding the $1T threshold, rather than an estimate of the company’s valuation.

According to predictionbubbles.net, its finance board reports probability changes over the preceding 24 hours and total traded volume where available. Those measures capture different things: a price shift indicates changing expectations, while cumulative turnover measures trading activity rather than the amount traded during that shift.

The supplied source page does not include the OpenAI contract’s detailed terms, a resolution deadline or reporting that explains the move. It therefore provides no basis for attributing the increase to a particular development at OpenAI.

What it means for prediction markets

• The time horizon changes the interpretation: the 3-point rise signals a near-term rebound, while the 2.5-point decline since Oct. 20 shows expectations remain lower over the broader period.
• Volume is not a directional signal: the $1.1M figure records trading activity; it does not establish what drove the latest increase.
• Resolution terms matter: the supplied material does not specify how the IPO closing capitalization will be determined or when the contract must resolve.
• The snapshot is time-specific: according to predictionbubbles.net, its data refreshes every 15 minutes, while trading on the underlying venues continues between updates.