Will OpenAI's valuation hit (LOW) $800B by December 31?

Prediction markets put the probability at 32%: Will OpenAI's valuation hit (LOW) $800B by December 31. Currently, markets are divided (32% YES, 68% NO).

What’s Happening

The market for "OpenAI's valuation hit (LOW) $800B by December 31" is trading with a 32% probability of a YES outcome, reflecting a cautious near-term view despite the company's aggressive growth trajectory. This contrasts sharply with the broader AI sector, where rival Anthropic has seen its annualized revenue surge to $43 billion in April 2026, up from $9 billion at the end of 2025, according to Sacra data cited by Financefeeds. The same report notes that Polymarket contracts price a 96% implied probability that Anthropic will surpass OpenAI in valuation at some point in 2026, while also giving OpenAI a 75.5% chance of listing publicly before its rival. These figures underscore a market that sees OpenAI's valuation hitting the $800B threshold as plausible but far from guaranteed within the calendar year, especially as the company's IPO timeline remains uncertain. [Financefeeds, Tue May 26]

The primary counter-signal to an $800B valuation by year-end comes from the IPO market itself. A separate Polymarket contract tracking the OpenAI IPO closing market cap, expiring January 1, 2027, prices the "no IPO by December 31, 2026" outcome at 79.5%, implying roughly a one-in-five chance of a listing in the back half of this year, as reported by 247wallst. Cumulative volume on that contract has reached $1,932,550.96, making it one of the deepest IPO markets on the platform. This suggests that while OpenAI commands a premium on the size question—conditional on an IPO occurring, the market assigns higher probabilities to larger valuations—the timing risk is substantial. The "OpenAI's valuation hit (LOW) $800B by December 31" contract must therefore contend with the possibility that a private market round, rather than a public listing, is what drives any valuation change before year-end. [247wallst, Tue Jul 07]

Adding to the competitive pressure, SpaceX has announced its own push toward an $800B valuation, with its CFO briefing investors on a new offering that follows an earlier sale valuing the company at roughly $400 billion, as reported by Stocktwits in December 2025. This has fueled speculation that SpaceX could overtake OpenAI in the private markets, with Cryptobriefing noting that Elon Musk's wealth could rise by $168 billion if the SpaceX valuation materializes. The convergence of these two companies at the same $800B mark creates a unique dynamic: while SpaceX's path is tied to a confirmed 2026 IPO timeline, OpenAI's trajectory remains murkier. For the "OpenAI's valuation hit (LOW) $800B by December 31" contract, the key variable is whether OpenAI can secure a private funding round at that level before the year closes, or whether it will wait for a public listing that may not occur until 2027. The current 32% probability reflects a market that sees the target as achievable but heavily dependent on execution timing. [Stocktwits, Fri Dec 05]

Traded on Polymarket — $89K Volume

Lower-volume market on Polymarket ($89K). Wider spreads expected — enter with limit orders and be aware of slippage risk. Currently 32c YES.