Which company has best AI model end of July?

Platform comparison

Active sub-markets

Market context

Anthropic’s Claude Opus 4.8 currently holds the top spot on the Chatbot Arena LLM Leaderboard, edging out GPT-5.5 with standout gains in coding and computer-use agents[1]. This market, showing just 11% implied probability for a YES outcome, reflects the crowd’s hesitation that Anthropic will maintain this lead through July 31, 2026, despite their recent dominance across text, code, and search arenas[2].

Historically, leaderboard volatility has been high; models like Opus 4.6 previously held #1 across all three LMSys leaderboards simultaneously before shifts occurred[2]. Comparable cases show that even top-ranked models can lose ground within weeks due to rapid iteration by competitors like Google’s Gemini or OpenAI’s GPT series, making early dominance a fragile indicator rather than a guaranteed settlement[2].

Traders should monitor Anthropic’s release schedule for any new Claude variants in late June or early July, as well as OpenAI’s planned GPT-5.6 update, which could disrupt current rankings[1]. Dependencies include the official Chatbot Arena check on July 31 at 12:00 PM ET, where any tie in rank will be resolved by Arena score[5]. Recent news from Artificial Analysis highlights Opus 4.8’s 61.4 Intelligence Index score, but warns that GPT-5.5 remains a close contender, suggesting the margin is narrow enough for a late swing[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Which company has best AI model end of July? 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.

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.

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.