OpenAI

Full rules

As written on Polymarket for “Will OpenAI have the best AI model at the end of December 2026?”.

1. §1This market will resolve according to the company which owns the model which has the highest arena rank based off the Chatbot Arena LLM Leaderboard (https://lmarena.ai/) when the table under the "Leaderboard" tab is checked on December 31, 2026, 12:00 PM ET.
2. §2Results from the "Rank" section on the Leaderboard tab of https://lmarena.ai/leaderboard/text with the style control off will be used to resolve this market.
3. §3Models will be ordered primarily by their leaderboard rank at the market’s check time.
4. §4If two or more models are tied on rank, they will be ordered by their Arena score, including any underlying, unrounded, granular values reflected in the data below the leaderboard.
5. §5If a tie remains, alphabetical order of company names as listed in this market group will be used as a final tiebreaker (e.g., if the two models are tied by exact arena score, “Google” would be ranked ahead of “xAI”).
6. §6This market will resolve based on the company that occupies first place under this ranking system.
7. §7The resolution source for this market is the Chatbot Arena LLM Leaderboard found at https://lmarena.ai/.