Which company has best AI model end of July?

Platform comparison

Active sub-markets

Market context

The market resolves on which firm holds the top Chatbot Arena rank by 31 July 2026, with the crowd currently pricing an 11% chance for the implied favourite. This low probability mirrors historical volatility where the leaderboard’s top spot has swung between Anthropic, OpenAI and Google within single months, often after a fresh model release or a benchmark surprise. In April 2026, Claude Opus 4.6 became the first model to dominate text, code and search arenas simultaneously, yet by June 2026, Anthropic’s newer Claude Fable 5 leads the composite quality index at 100/100, while Claude Opus 4.8 (released 28 May) tops the Artificial Analysis Intelligence Index with standout gains in coding and computer-use agents[1].

Traders must watch for three key catalysts: the release schedule of GPT-5.5 (expected late July), any new Grok variant from xAI, and whether Anthropic pushes a successor to Fable 5 before the settlement window. Recent reports confirm Opus 4.8’s coding score of 69.2% on SWE-bench Pro and 84% on Online-Mind2Web, edging out GPT-5.5[1]. A delayed GPT-5.5 launch or a sudden performance dip in Opus 4.8 could shift the arena rank dramatically. The dependency on human voting in Chatbot Arena means sentiment shifts after developer announcements or media coverage can alter rankings faster than pure benchmark data.

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

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.

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.

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.