OpenAI announce another Millennium Prize solution by December 31, 2027 priced at 55.5% on Polymarket

A Polymarket contract on whether OpenAI will announce another Millennium Prize solution by December 31, 2027 was priced at 55.5%, down 4.0 probability points, in the supplied October 24, 2026 market summary. Reported trading volume was $396K.

The price still put the affirmative outcome above an even chance, despite the decline. The supplied material does not identify a news event or announcement behind the move.

How the move is measured

According to predictionbubbles.net, its market-movers tracker measures changes over 24 hours using probability points rather than relative percentages. The reported 4.0-point decline therefore describes a shift in the contract’s implied probability, not a 4.0% relative fall.

The outlet says it draws prices from Polymarket and Kalshi and updates its rankings every 15 minutes. The supplied page records a venue-data snapshot at 21:13 UTC on 24 Oct 2026 and describes a universe of 1,970 markets with lifetimes longer than 14 days.

Limits of the available evidence

The supplied tracker text explains its methodology but does not display an OpenAI-specific entry. The 55.5% price, 4.0-point decline and $396K traded figure come from the accompanying headline and summary; those figures cannot be independently checked against a contract listing in the provided excerpt.

Nor does the material include the contract’s resolution rules. Its wording concerns an OpenAI announcement by December 31, 2027, but the evidence required for that announcement to qualify is not specified here.

What it means for prediction markets

• Lower pricing, still above even: The 55.5% reading indicates that the affirmative outcome remained favored after the 4.0-point decline.
• Volume is context, not proof of depth: The reported $396K traded does not establish available liquidity or explain what drove the move.
• Resolution language matters: Without the full rules, readers cannot determine precisely what would count as another Millennium Prize solution announcement.
• Repricing is not confirmation: The decline records a change in market pricing, not evidence that OpenAI’s underlying prospects changed.