Will OpenAI’s market cap be between $1T and $1.25T at market close on IPO day?

Prediction markets put the probability at 5%: Will OpenAI’s market cap be between $1T and $1.25T at market close on IPO day. Currently, markets see this as unlikely (5% YES). OpenAI closes record $122 billion round at $852 billion valuation, opens door to retail investors for the first time.

As of April 2026, prediction markets price "Will OpenAI’s market cap be between $1T and $1.25T at market close on IPO day?" at 5% YES on Polymarket with $173K in trading volume. Our 5 AI models estimate fair value at 8c — a 3-point gap vs market price.

What’s Happening

OpenAI has closed a $122 billion funding round at a post-money valuation of $852 billion, the company announced on Tuesday, March 31, 2026. This record-breaking private capital raise, which included a $3 billion tranche opened to retail investors for the first time, significantly elevates the company's financial baseline ahead of a potential public listing. The current valuation sets a formidable benchmark, making the question of whether OpenAI’s market cap be between $1T and $1.25T at market close on IPO day a central focus for analysts gauging public market appetite for mega-cap technology offerings. [The Next Web, Mar 31]

The valuation surge reflects intense institutional confidence, with Amazon, Nvidia, and SoftBank anchoring the round, and underscores the colossal capital requirements for frontier AI development. Historically, such pre-IPO valuations have compressed first-day trading pops; for context, Rivian Automotive Inc. debuted in 2021 at a $66.5 billion market cap after a last private round near $27.6 billion, illustrating how late-stage private mark-ups can limit immediate public upside. Achieving a trillion-dollar valuation at debut would place OpenAI in a cohort with only a handful of companies, a threshold dependent on sustained investor euphoria and flawless execution. [MLQ.ai, Apr 01]

Market capacity is a critical consideration, as OpenAI is anticipated to launch its IPO alongside other potential mega-listings like SpaceX and Anthropic, which together could absorb capital equivalent to all U.S. VC-backed IPOs over the past decade. The macro environment will be pivotal; a soft landing scenario with supportive equity risk premiums could facilitate such a high valuation, whereas tighter financial conditions or inflation surprises could dampen demand. The trajectory to see OpenAI’s market cap be between $1T and $1.25T at market close on IPO day will hinge on this interplay of company-specific momentum and broader market liquidity. [Business Today, Apr 02]

Traded on Polymarket — $173K Volume

Polymarket prices this at 5c YES with $173K in volume. Moderate liquidity — use limit orders for positions above $1K to avoid moving the price.