OpenAI Is Likely to Debut Above $1 Trillion

OpenAI's eventual IPO is shaping up to be one of the most consequential public offerings in a generation, and the money betting on its outcome has grown sharply more bullish in the past 24 hours. The probability that OpenAI prices below $1 trillion has fallen to roughly one-in-five — down from a high of 40% just over two months ago — as bettors rotate toward the $1.25 trillion-to-$2 trillion range, where three adjacent outcome bands now each command roughly equal weight.

The deeper read across related markets is not simply that a sub-$1 trillion debut looks unlikely; it is that the money has begun clustering around a genuinely large number. The $1.5T–$1.75T and $1.75T–$2.0T bands each gained ground in the past day, and a separate market on whether OpenAI's market cap closes at or above $1.5 trillion on IPO day sits at 44%. That is not a strong lean, but it is no longer a long shot. A market on the closing price exceeding $800 billion sits at 75% — a level that warrants calling it likely — which sets a credible floor and implies the debate has shifted to the ceiling, not the threshold.

Timing, however, is the constraining variable the bullish valuation story cannot ignore. OpenAI listing in 2026 is now all but ruled out, with that contract sitting at 96% for 'no IPO by December 31, 2026.' The probability of a listing by June 30, 2027 is only around 40%, meaning the most likely window is the second half of 2027. That two-year runway matters enormously for valuation: it gives the company time to grow into — or fail to grow into — whatever multiple the market is currently willing to assign. The conviction here should be read carefully; this market has crossed conviction-tier boundaries six times in 75 days of observation, and the current bullish lean could shift again if the macro environment changes or OpenAI's restructuring toward a for-profit entity encounters legal or governance friction.

One genuine puzzle sits inside the data. A market asking whether Anthropic will have the highest IPO market cap in 2026 is priced at 44% on one venue and, on a thinner competing venue, at 99% — a spread so wide it reflects either a contract-definition mismatch or a dramatic difference in the sophistication of the participants. The deeper venue, which traded roughly four times as much in the past day, holds the 44% read, and that is the figure that earns more weight here. What both venues agree on is that OpenAI is the more likely of the two AI giants to list first, with that outcome sitting in the high nineties. The race to the public markets between the two leading AI labs appears to have a strong favorite, even if the precise timing and the valuation remain genuinely open.

What this all means practically is that the window for anyone pricing OpenAI at a startup-era discount has likely closed. Goldman Sachs is favored at 72% to serve as lead underwriter — a signal about the seriousness of preparations — and the IPO raise is roughly evenly split around the $90 billion-to-$100 billion range, though that market saw no new trading today and deserves less weight. The path most consistent with the full picture is a late-2027 listing at a valuation somewhere in the $1.25 trillion-to-$2 trillion band, with the money nudging toward the higher half of that range. The scenario that would break this read: a prolonged delay past 2027, a major governance disruption around Sam Altman's reported push for super-voting shares (currently priced at only 27% to succeed), or a broad repricing of AI equities that pulls the comparable-company benchmarks down before OpenAI ever files. Until one of those forces arrives, the floor looks firm and the argument is about just how high the ceiling goes.