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, 2027?
53%
▲ +4.0pt
Vol $50.2K today · $473.8K total
Possibly the same event, on the other platform
Kalshi
Will OpenAI announce another Millennium Prize solution before Jan 1, 2027?
23%
Kalshi
Will OpenAI announce another Millennium Prize solution before Jan 1, 2028?
63%
Kalshi
Will any AI lab solve a Millennium Prize Problem before 2027?
25%
Kalshi
Will any AI lab solve a Millennium Prize Problem before Jul 1, 2027?
50%
Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.