Which company has best AI model end of June?

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Market context

The real-world event determining this contract is the Chatbot Arena LLM Leaderboard snapshot taken on 30 June 2026 at 12:00 PM ET, where the company owning the model with the highest arena rank resolves the market. Current crowd-implied probability sits at 0% for the “yes” outcome, suggesting traders believe no single company will dominate the final ranking or that the resolution criteria may favour a tie-breaker favouring an alternative entity.

Historical leaderboards show rapid volatility in top rankings; for instance, Anthropic’s Claude Fable 5 currently leads the June 2026 composite index at 100/100 across 357 models, yet past snapshots reveal frequent shifts between Anthropic, OpenAI, and Google within weeks[1]. Comparable cases from 2024–2025 indicate that even dominant models can lose top rank due to new releases or benchmark recalibrations, making a 0% implied probability a plausible reflection of uncertainty rather than certainty of failure.

Traders should monitor upcoming model releases scheduled for late June, particularly from OpenAI and Google, alongside any announced changes to the Arena scoring methodology. A recent Manifold Markets resolution note confirms that alphabetical order of company names breaks ties if arena scores are identical, adding a non-performance factor to the outcome[2]. Additionally, UC Berkeley’s Chatbot Arena remains the most cited leaderboard, meaning any methodology shift there could directly alter the final ranking[7]. Watch for announcements from major labs between 25–30 June, as these often trigger immediate leaderboard movements.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Which company has best AI model end of June? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 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.