Which company has best AI model end of July?

Platform comparison

Active sub-markets

Market context

The real-world event hinges on which company owns the model ranked highest on the Chatbot Arena LLM Leaderboard when the table is checked at 12:00 PM ET on 31 July 2026. Current crowd-implied probability sits at 11% YES, reflecting uncertainty despite Anthropic’s Claude Fable 5 leading the June 2026 composite index at 100/100 across 357+ models[1].

Historical precedent shows leaderboard dominance can shift rapidly; Claude Opus 4.6 briefly held #1 across all three LMSys leaderboards simultaneously in April 2026, only to be edged out by newer variants months later[2]. Such volatility frames the 11% probability as a cautious bet on continuity rather than a guarantee, given that Arena scores are battle-tested and community-driven, not static benchmarks[10].

Traders should monitor release schedules for Claude Opus 4.8 (May 2026), which topped the Artificial Analysis Intelligence Index at 61.4 with standout coding gains, and GPT-5.5, its closest rival[1]. Dependencies include whether the leaderboard check excludes “Thinking” variants or weights search/code tasks differently. Regulatory accessibility is shaped by German GlüStV rules permitting no-KYC trades up to €1,500, alongside US CFTC reach over prediction markets, making this market accessible to German retail traders without identity verification for smaller stakes.

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 PolyGram, which mirrors the Polymarket order book directly.

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.

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.

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.