Which company has best AI model end of June?

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Market context

The June 30 check will be decided by whichever company has the top model on the Chatbot Arena leaderboard at noon ET, so the market is really a race for the highest-ranked single entry rather than the broadest product line. That keeps the present 24% implied chance in context: leaderboard leadership has shifted between OpenAI, Anthropic and Google in recent months, with Stanford HAI noting in its 2026 AI Index that the top closed model has widened its lead over the top open model, while six of the top ten Arena models are now from a small set of major labs. In practice, a market like this tends to reward the company with the most frequent frontier releases and the strongest update cadence, rather than the firm with the biggest installed base.

The key watchpoint is whether any lab ships a new flagship before the end of June and whether that model lands immediately near the top of Arena rankings. Recent roundup coverage has described Gemini 3.1 Pro, Claude Opus 4.6 and GPT-5.4 as the main premium contenders, with Google highlighted for reasoning, Anthropic for agentic and professional work, and OpenAI for ecosystem breadth. Traders should watch official model launches, benchmark claims and any re-rankings on lmarena.ai after major updates, because Arena standings can move quickly once fresh models start accumulating votes. If one company holds the lead through late June without a disruptive release from a rival, the market will look materially more one-sided than it does now.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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 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.