Which company has top AI model end of June? (Style Control On)

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Market context

The real-world event is a straightforward leaderboard check: on 30 June 2026 at 12:00 PM ET, the Chatbot Arena will rank models by their Text Arena score, and the company owning the top-ranked model wins. With the crowd implying only a 2% chance that OpenAI holds that spot, the consensus heavily favours Anthropic, whose Claude Fable 5 currently leads the composite quality index at 100/100 across 357+ models[2].

Historically, such leaderboards have shown rapid shifts; a model ranked second in one quarter can leap to first in the next if a major update arrives, as seen when earlier versions of Claude and GPT swapped dominance within months[4]. The 2% figure suggests the market treats OpenAI’s path as nearly closed, yet comparable cases reveal that underdogs with strong engineering pipelines can still seize value if a surprise release lands just before the check date.

Traders should watch for Q2 2026 model announcements from OpenAI and Google, particularly any late-June releases that could alter the arena score before the deadline. Recent coverage notes that LMSys updates its snapshots daily, making timing critical for any new entrant[3]. A contrarian angle lies in betting on a last-minute OpenAI launch, as the current price may undervalue the impact of a high-scoring model released days before the settlement window.

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 Who Will Win, 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

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Who Will Win 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.

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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.