Trade: Which company has the second best AI model end of May?

Market context

The Chatbot Arena Leaderboard ranks large language models through comparative user voting, with the settlement contingent on which company owns the second-ranked model on 31 May 2026. Current order book activity on Polymarket prices this outcome at 86% implied probability, reflecting confidence in a specific company maintaining that position through the settlement window. The leaderboard uses the "Text Arena | Overall" rankings with style control disabled, ordering primarily by rank position and secondarily by Arena Elo score in case of ties.

Historical precedent suggests leaderboard positions remain relatively stable over medium-term horizons, though significant model releases can shift rankings substantially. Anthropic, OpenAI, and Meta have dominated top positions across recent leaderboard snapshots, with their respective Claude, GPT, and Llama variants consistently occupying the highest tiers. The 86% probability likely reflects market confidence that one of these established players will retain the second position, rather than displacement by emerging competitors or smaller-scale developers.

Traders should monitor scheduled model releases from major laboratories through early 2026, particularly any announcements from OpenAI, Anthropic, or Meta regarding new versions or capability improvements. Changes to the Arena's evaluation methodology or voting mechanisms could also influence final rankings. The settlement depends entirely on leaderboard data at a specific timestamp, making the exact state of model performance on that date the critical variable—recent performance trends and release schedules through spring 2026 will provide the most reliable indicators for position assessment.

How this market resolves

Resolution is handled by the UMA optimistic oracle on Polygon. A proposer submits the outcome, a two-hour dispute window opens, and if no one stakes a counter-claim the payout is final. Contested outcomes escalate to UMA token-holder voting. Payouts clear in USDC to the winning side.

How to trade this market step by step

The mechanics for trading "Which company has the second best AI model end of May?" are the same as any other PolyGram event contract. Each YES share resolves to $1 if the event happens, or $0 if it doesn't. The current price between 0¢ and 100¢ is the market's probability estimate, set live by the order book.

1. Sign in on polygram.ink with your email — no full KYC under $1,500 lifetime trading volume.
2. Deposit USDC on Polygon (lowest fees, ~$0.01 per transaction) or Ethereum. Funds credit after 12 confirmations.
3. Pick a side. Buy YES if you believe the event will happen; buy NO if you think it won't. The current YES price reflects the market's collective probability.
4. Size your position. If you stake 100 USDC at 50% YES, you'll receive shares that pay $200 if YES resolves true — a 100% gross return. If NO resolves, your shares are worth $0.
5. Set risk controls (optional). Stop-loss, take-profit, and limit-order types all supported. Use the trade ticket's slippage box to cap your maximum entry price.
6. Wait for resolution. When the event resolves on-chain via the UMA optimistic oracle, the winning side settles to 100¢ automatically and USDC hits your balance within seconds. Withdrawable to any wallet you control.

How active is this market?

$51K in lifetime turnover and $70K of resting liquidity puts this market in the above the median by volume for tech contracts on PolyGram. Order-book depth is exceptional — among the deepest order books in the category.

Last 24 hours alone saw $310 in turnover, consistent with the market's lifetime daily-average pace.

The market has been open for under a month — fresh enough that information asymmetry remains a real factor.

Higher-volume markets tend to have tighter spreads and faster price discovery — meaning the displayed YES/NO percentages are more likely to reflect the true crowd-implied probability rather than a single trader's directional view.

Key terms

YES / NO share

A binary outcome token that pays $1.00 if the underlying claim resolves true (YES) or false (NO), and $0 otherwise. The market price between 0¢ and 100¢ is the implied probability.

CLOB

Central limit order book. The matching engine that pairs YES buyers with NO buyers (effectively the same trade). Polymarket's CLOB on Polygon executes trades on-chain via the conditional-tokens framework.

Liquidity

USDC capital sitting in resting limit orders inside the order book. Deeper liquidity means smaller slippage on large trades and a tighter bid-ask spread.

UMA optimistic oracle

The on-chain dispute system that settles each Polymarket market. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution.

Slippage

The difference between the displayed mid-price and your fill price. Affects market orders most; limit orders avoid slippage but may take time to fill.

Conditional token

ERC-1155 outcome share issued by Gnosis Conditional Tokens on Polygon. The token type that resolves to $1.00 or $0.00 at settlement.

See the full prediction-market glossary →

Frequently asked questions

Risk and regulatory note

Prediction-market positions can lose 100% of staked capital. Outcomes are uncertain by definition — historical accuracy of crowd-implied probabilities is high in aggregate but not for any single market. PolyGram does not provide investment advice. Trade only with capital you can afford to lose.

Regulatory status varies by jurisdiction. Germany, the United States, and most EU countries treat Polymarket-style event contracts under one of three frameworks: financial derivative, gambling product, or unregulated novel asset. Consult local counsel before trading.

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