Polymarket vs. Kalshi
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See where the two biggest prediction markets disagree. Pick any two markets, or start from the biggest gaps below: prices, volume, history and the resolution rules, side by side.
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Will OpenAI announce another Millennium Prize solution by December 31, 2026?
15%
▲ +2.5pt
Vol $29.8K today · $409.5K total
Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.