OpenAI is about to file for an IPO, and prediction markets think Anthropic just lost the race to go public first

https://media.thenextweb.com/2026/05/openai-ipo-confidential-filing-anthropic-race.avif

TL;DR

OpenAI is preparing to confidentially file for an IPO as soon as this week, targeting a trillion-dollar autumn debut with Goldman Sachs and Morgan Stanley. Prediction market odds swung sharply in its favour, with Anthropic’s chances of listing first collapsing from 69 per cent to 20 per cent.

The AI industry’s most consequential race is no longer about building the best model. It is about getting to public markets first. OpenAI appears to have taken the lead.

The company is preparing to confidentially file a draft of its IPO prospectus as soon as this week, according to CNBC, with Goldman Sachs and Morgan Stanley advising on the process. The target is an autumn debut, potentially as early as September, at a valuation that could exceed $1 trillion.

That timeline caught prediction market traders off guard. Before the Wall Street Journal first reported the filing plans, Kalshi traders gave OpenAI...

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