Which company has the best AI model end of September?: how this market works

What you need to know

This market is asking: on September 30, 2026, which company, Anthropic, Google, or OpenAI, will have the single top-ranked AI chatbot on a public leaderboard called arena.ai? That leaderboard ranks models based on millions of real user votes, where people chat with two anonymous AI models side by side and pick the one they prefer. The winner is simply whoever built the model sitting in first place on that list at noon Eastern time on that date. At 12:00 PM ET on September 30, 2026, someone will check the arena.ai Text Arena Overall leaderboard with style control turned off and no filters except 'Models.' Whichever company owns the model in the number one rank slot wins. If two models are tied on rank, the tiebreaker goes to the higher underlying score, and if that is also tied, alphabetical order of company names decides it. If the website is down that day, the check happens as soon as it comes back online. The recent headlines provided do not directly relate to this market. They cover Microsoft investing in Mistral, SpaceX exploring Pentagon AI deals, and general AI policy news. None of them describe a shift in the arena.ai leaderboard rankings. The kind of news that would actually matter here is a major new model release from Anthropic, Google, or OpenAI that changes how users rate them head to head. AI model rankings can shift quickly. A single major model release between now and September 2026 could move any company from first to third place overnight. Anthropic currently holds 86% in this market, reflecting its strong leaderboard position right now, so the main uncertainty is not a close three-way race but rather whether an unexpected release from Google or OpenAI disrupts that lead. Over a year is a long time in AI development, and surprise releases have happened before.

The odds right now

• Anthropic86%
• Google8%
• OpenAI5%
• Moonshot3%
• Meta2%
• SpaceXAI1%
• Alibaba1%
• Baidu1%
• MiniMax1%
• Meituan1%
• Z.ai1%
• Amazon1%

Price history

How this resolves

Resolves September 30, 2026

This market will resolve according to the company which owns the model which has the highest arena rank based on the arena.ai Text Arena (Overall) when the table under the "Leaderboard" tab is checked on September 30, 2026, 12:00 PM ET. Results from the "Rank" column under the "Text Arena | Overall" Leaderboard tab at https://arena.ai/leaderboard/text/overall-no-style-control with style control off (Adjustments: None) and filtered for "Models" will be used to resolve this market. Read the full resolution rules on the live market page.

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