Which company has the best AI model end of May?

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Active sub-markets

Market context

The market is pricing Anthropic as a very heavy favourite at 1% yes for the company to own the top-ranked model on Chatbot Arena at the May 31 check, with the consensus centred on whether its current lead can be defended for another leaderboard cycle. That makes this less a broad call on model quality than a narrow ranking snapshot, where the edge often belongs to the incumbent unless a rival lands a clean release just before the cut-off. In comparable Arena-style markets, the favourite tends to stay short when the leaderboard gap is clear, but late model launches can compress the odds quickly if they score well on general preference rather than one benchmark alone. The obvious contrarian angle is Google, which is usually the main underdog in this setup: if it ships a strong Gemini update in time, the market’s 1% implies very little credit has been given to that path.

The main catalysts are release timing, leaderboard refreshes and whether any near-term model announcements are eligible before the 31 May noon ET check. Traders will be watching for Anthropic to defend its position with fresh Claude variants, while Google and OpenAI remain the most plausible challengers if they move first. Recent benchmark chatter has kept Anthropic at the front of market consensus, but the resolution rule is specific: only the Arena rank at the scheduled check matters, not general press coverage or developer sentiment. That creates value in looking for last-minute schedule risk, since a strong model launched after the cutoff will not help, and a weaker-than-expected release can leave the favourite exposed despite its current lead.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.