Which company has best AI model end of June?

Platform comparison

Active sub-markets

Market context

Anthropic’s Claude Fable 5 currently tops the June 2026 LMSys Arena leaderboard, holding a perfect 100/100 composite quality score across 357 models ranked by performance, price, and speed[1]. This mirrors the trajectory seen in late February 2026 when Claude Opus 4.6 first secured the #1 position across all three LMSys Chatbot Arena leaderboards simultaneously, a feat no OpenAI, Google, or xAI model has replicated since[2]. The current 0% crowd-implied probability for any other company reflects this historical dominance, where early leaderboard leaders have consistently maintained top arena ranks through settlement windows, suggesting Anthropic’s lead is unlikely to be overturned by June 30, 2026.

Traders must monitor the daily auto-updated snapshots of the LMSYS Chatbot Arena leaderboards, which track text, code, vision, and video performance in real time[3]. Key catalysts include the release schedules for upcoming models from OpenAI’s GPT-5.2 and Google’s Gemini 3.1 Pro, both currently trailing Opus 4.6 in text and search arenas with scores of 1481 and 1500 respectively[2]. Any sudden shifts in arena scores or the introduction of new style-control settings could alter rankings, but the current data shows Anthropic maintaining a 30-point lead over Grok-4.20-beta1 in search and a 2-point lead over Opus 4.6 Thinking in text[2]. The settlement depends strictly on the leaderboard table checked at 12:00 PM ET on June 30, 2026, making near-term benchmark updates the primary dependency for probability changes.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Which company has best AI model end of June? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in 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.