Which company has best AI model end of June?

Platform comparison

Active sub-markets

Market context

The real-world event determining this market is the Chatbot Arena LLM Leaderboard’s final ranking on 30 June 2026 at 12:00 PM ET, where the company owning the model with the highest arena rank will be declared the winner. As of mid-June 2026, Anthropic’s Claude Fable 5 leads the composite quality index at 100/100 across 357 models, setting a clear benchmark for arena dominance[1]. This historical precedence mirrors early 2026 trends where Anthropic consistently held the top arena score, peaking at 1481 in February, suggesting a high probability of continued leadership rather than a sudden shift[7]. The current 0% implied probability on the YES side appears inconsistent with this trajectory, likely reflecting a platform-specific divergence in how Polymarket, Kalshi, and Betfair interpret decimal odds versus implied probability, alongside differing fee structures and KYC thresholds that skew crowd sentiment.

Traders should monitor Anthropic’s upcoming model release schedule and any planned arena re-rankings scheduled for late June, as these are primary catalysts for rank changes. Recent coverage from Arena AI confirms that leaderboard positions remain fluid, with models ordered by arena score when ranks tie, meaning even minor Elo fluctuations could alter the outcome[5]. The dependency on human preference data through pairwise comparisons, as defined by UC Berkeley’s Chatbot Arena methodology, ensures that real-time user feedback directly influences final rankings[3]. Unlike Kalshi’s regulatory-backed certainty, platforms like Polymarket may exhibit higher volatility in implied probabilities due to lighter KYC requirements, while Betfair’s decimal odds format could obscure the true risk profile compared to probability-based interfaces. This market’s resolution hinges on a single, transparent data point, making it a prime case for comparing how different books diverge in pricing efficiency and settlement reliability.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Which company has best AI model end of June? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

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). PolyGram routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

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.

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.

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.