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.
Polymarket is 59 points higher than Kalshi (67% vs 8%). Polymarket trades about 741× more volume today, so its price has more money behind it. They resolve on different dates (Dec 1 vs Jan 1), so they may not be exactly the same bet.
History starts when we first saw each market, so a newly added market has a short line.
| Polymarket | Kalshi | |
|---|---|---|
| Probability (Yes) | 67% | 8% |
| Change (24h) | +11.0 pt | -0.5 pt |
| Volume today | $35.5K | $48 |
| Total volume | $355.2K | $209.4K |
| Liquidity | $21.1K | — |
| Open interest | — | $52.8K |
| Resolves | 43d | 161mo |
| Tracked for | 7 days | 9 days |
Resolution rules: read both before trusting a gap
Polymarket
This market will resolve to "Yes" if Anthropic shares are listed on a public securities exchange and open for trading by 11:59 PM ET on the listed date. Otherwise, this market will resolve to "No." If Anthropic is acquired by another company that is already public, this market will immediately resolve to "No." The primary resolution source for this market is official filings and announcements from Anthropic and the relevant securities exchange on which the shares are listed, including SEC filings (e.g., Form S-1, Form 8-A), exchange listing confirmations, and official press releases from Anthropic; however a consensus of credible reporting may also be used.
Kalshi
If OpenAI confirms an IPO first, before Jan 1, 2040, then the market resolves to Yes.
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Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.