Which company has top AI model end of June? (Style Control On)

Resolution Criteria

This market will resolve according to the company that owns the model with the highest arena rank based on the Chatbot Arena LLM Leaderboard (https://lmarena.ai/) when the table under the "Leaderboard" tab is checked on June 30, 2026, 12:00 PM ET. Results from the "Rank" column under the "Text Arena | Overall" Leaderboard tab at https://lmarena.ai/leaderboard/text with style control on will be used to resolve this market. Models will be ordered primarily by their leaderboard rank at the market’s check time. If 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. If 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”). This market will resolve based on the company that occupies first place under this ranking system. The resolution source for this market is the Chatbot Arena LLM Leaderboard found at https://lmarena.ai/. If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and resolves based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve based on another resolution source.

Anthropic is the heavily-backed favourite to hold the top-ranked AI model on the Chatbot Arena LLM Leaderboard (style control on) at the end of June 2026, with Google as the only other contender drawing significant volume. The market covers 19 possible outcomes across the world's leading AI companies. Resolution is determined by the official leaderboard rank at lmarena.ai on 30 June 2026 at 12:00 PM ET.

Market structure

Nineteen outcomes are listed, but volume is heavily concentrated on two companies: Anthropic and Google, with all other outcomes drawing minimal interest. Resolution uses the 'Text Arena | Overall' leaderboard tab at lmarena.ai with style control enabled. The check is scheduled for 30 June 2026 at 12:00 PM ET. Tiebreakers cascade through Arena score (including granular unrounded values) and then alphabetical order of company name.

Background

Chatbot Arena, operated by lmarena.ai, is one of the most widely cited independent benchmarks for large language model quality. It uses a crowdsourced head-to-head voting system — often described as an Elo-style ranking — where human evaluators compare model outputs without knowing which model produced them. The 'style control' variant adjusts scores to reduce the influence of response length and formatting on votes, making it a closer measure of substantive quality. Rankings on the leaderboard shift regularly as new models are submitted and additional votes accumulate. The period to June 2026 is expected to see further major model releases from most of the companies listed, making the final standings genuinely uncertain. Anthropic's Claude model family and Google's Gemini series have been prominent in recent leaderboard standings, which is reflected in the current distribution of market volume.

Key factors

Several structural factors could determine which company holds the top rank by 30 June 2026. First, the timing of new model releases matters significantly: a company that releases a flagship model close to the resolution date may have limited votes accumulated, while one that released earlier may benefit from a larger and more stable vote base. Second, the style control adjustment itself reshapes rankings compared to raw scores, meaning models that perform well on substance rather than presentation are advantaged. Third, the leaderboard is dynamic — a model leading in May could be displaced by a new entrant in June. Fourth, tie-breaking rules favour companies earlier in alphabetical order, which could become relevant if top models converge in score. Fifth, whether major frontier labs — including those currently receiving little market volume — release unexpectedly strong models in the intervening months represents a tail risk. The availability of the lmarena.ai leaderboard at the exact check time also carries a contingency provision.

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