Which company has best AI model end of July?

Platform comparison

Active sub-markets

Market context

The real-world event determining this market is the final ranking on the Chatbot Arena LLM Leaderboard as checked on 31 July 2026 at 12:00 PM ET, where the company owning the highest-ranked model secures the outcome. Currently, the crowd implies an 11% chance for the “yes” position, suggesting the market views the leading contender as a significant long shot despite recent performance gains.

Historical precedents from the 2024 and 2025 leaderboard cycles show that arena rankings can shift dramatically within weeks due to model updates, often rendering early-season leaders obsolete by summer. For instance, a model trailing by five points in May frequently overtakes the top spot by July after a single major release, making the current 11% probability reflective of high volatility rather than a settled consensus. Platforms like Polymarket express this as decimal odds (roughly 9.09), whereas Kalshi and Betfair frame it as implied probability, while Smarkets applies a lower fee structure that may attract more speculative volume on such uncertain outcomes.

Traders should monitor the release schedules for Claude Opus 4.8 and GPT-5.5, both expected in late June or early July, as these updates could decisively alter the arena score. Recent coverage from Artificial Analysis notes Claude Opus 4.8’s standout gains in coding and computer-use agents, which may propel it past current leaders if the leaderboard weights these capabilities heavily [1]. Divergence between books remains stark: Kalshi requires full KYC and offers binary contracts, while Polymarket permits anonymous trading with crypto settlement, creating different liquidity dynamics for this specific event.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Which company has best AI model end of July? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

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

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.

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.