Which companies will have a #1 AI model by June 30?

Resolution Criteria

This market will resolve to "Yes" if the listed company has the highest arena score on the Chatbot Arena LLM Leaderboard (https://lmarena.ai/) for any amount of time by June 30, 2026, 11:59 PM ET. Otherwise, this market will resolve to "No." Results from the "Arena Score" section on the Leaderboard tab of https://lmarena.ai/ with the style control unchecked will be used to resolve this market. If a listed model ties for #1 Arena score, it will suffice to resolve this market to "Yes." The resolution source for this market is the Chatbot Arena LLM Leaderboard found at https://lmarena.ai/. If this resolution source becomes unavailable, the market will remain open until it is accessible again. If it becomes permanently unavailable, resolution will be based on another credible source.

This market asks which AI companies will hold the #1 position on the Chatbot Arena LLM Leaderboard (lmarena.ai) at any point before 30 June 2026. Volume across the eleven listed outcomes is broadly distributed, with no single contender heavily dominant. OpenAI is the heaviest-backed outcome, followed by Meta and xAI, though the field remains wide open. Resolution uses the Arena Score section of lmarena.ai with style control unchecked.

Market structure

Eleven company outcomes are listed, each resolving 'Yes' independently if that company's model holds the #1 Arena Score on lmarena.ai for any duration before 30 June 2026 11:59 PM ET. Volume is broadly distributed across the field rather than concentrated on one or two names. A tie for first place counts as sufficient for 'Yes'. The resolution source is lmarena.ai; if unavailable, the market remains open until the site returns or a credible alternative is used.

Background

Chatbot Arena, maintained by researchers originally at UC Berkeley's LMSYS group and now operating as lmarena.ai, is one of the most widely cited benchmarks for large language model quality. It uses a crowdsourced Elo-style rating system in which human evaluators compare model outputs in blind head-to-head tests, producing an Arena Score that reflects aggregate human preference rather than narrow task metrics. The leaderboard has become a reference point for the AI industry precisely because it captures general conversational quality. The period to June 2026 spans a stretch of intense model competition among US and Chinese technology companies, with new frontier models releasing on cycles measured in months rather than years.

Key factors

The Arena Score ranking updates continuously as new human votes accumulate, meaning the #1 position can change hands as fresh models launch. A company need only hold first place momentarily to trigger 'Yes' resolution, which lowers the bar significantly compared to markets requiring sustained dominance. Key structural factors include: the pace at which each company releases new flagship models before the deadline; whether any company releases a model that generates a surge of Chatbot Arena evaluations; the methodology of lmarena.ai itself, since scoring weights and vote normalisation practices can shift leaderboard positions without a new model launch. Chinese AI developers — including DeepSeek, Alibaba, Baidu, Z.ai, and Meituan — have released competitive models that have previously appeared near the top of the leaderboard, making the market genuinely multinational. The 'style control unchecked' specification matters: style-adjusted scores can diverge meaningfully from raw Arena Scores, and only the latter count here.

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