Who will win the 2026 Fields Medal?

Platform comparison

Market context

The 2026 Fields Medal will be awarded at the International Congress of Mathematicians in July, with the market resolving on the official medal winners rather than on the conference programme itself. Because the current crowd-implied probability is 0% YES, the practical read is that the listed outcome is being treated as effectively impossible unless traders see a late information shock before the IMU announcement window closes.

Recent comparable trading has shown that the race can move sharply on thin information, and that the leading names can differ across venues. In June, one market report said Efimov fell from 18% to 9%, with Kalshi at 10% and Polymarket at 8%, a small enough spread to suggest broad agreement on the direction even if conviction was limited[1]. Other market coverage has had Hong Wang, Yu Deng, John Pardon, Jacob Tsimerman, Sam Raskin and Jack Thorne all appearing near the front at different points, which is a reminder that Fields Medal pricing often reflects expected multi-laureate outcomes rather than a single clear favourite[3][4][7][8].

For traders comparing platforms, the main differences are in presentation and frictions rather than the underlying event: Polymarket quotes crowd-implied probabilities directly, while Kalshi and Betfair-style books are usually read through decimal odds or prices, which can make same-name comparisons look different even when the view is similar[1][4]. Fee structure and KYC reach also matter: exchange-style platforms can be more accessible in some jurisdictions, but access and verification rules vary by venue, so the same contract may not be tradable for the same user across platforms. The main catalysts left are the IMU announcement itself, any schedule confirmation from the Congress, and whether the official list is published before the market’s August deadline; if the medalists are not announced by 15 August 2026 at 23:59 ET, the market resolves to Other.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Who will win the 2026 Fields Medal? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.