Pronóstico: Which company has best AI model end of June?

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Active sub-markets

Market context

The real-world event is the final Chatbot Arena LLM Leaderboard check on 30 June 2026, which will crown the company owning the model with the highest arena rank. Current crowd-implied probability sits at 0% for a "YES" outcome, suggesting the market expects no single winner to dominate decisively or that the resolution criteria may be ambiguous. Historically, similar leaderboard races have seen rapid shifts; in February 2026, Anthropic’s Claude Opus 4.6 became the first model to hold #1 across all three LMSys leaderboards simultaneously, a feat no OpenAI, Google, or xAI model has replicated yet [2]. However, by June 2026, Anthropic’s newer Claude Fable 5 leads the composite quality index at 100/100 across 357+ models, indicating a potential consolidation of top-tier performance under one firm [1].

Traders must watch for final benchmark releases and model updates scheduled before the 30 June check, as minor Elo adjustments could alter the ranking. Recent data shows Opus 4.6 still dominates the Code Arena with a 1560 score, nearly 90 points ahead of GPT-5.2, while Text Arena remains tightly contested between Opus 4.6 and its "Thinking" variant [2]. Any announcement of a new OpenAI or Google model with a significant Elo jump could disrupt Anthropic’s lead, though no such release has been confirmed in recent weeks. The dependency on the specific "Leaderboard" tab check time means even a 12-hour delay in data updates could shift the outcome, making the exact timing of the table refresh a critical variable to monitor.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.