This topic covers event contracts that ask which Chinese AI company will hold the top position on the Arena AI Text leaderboard at a stated check time. Kalshi lists separate events for the week of October 12th, the week of October 19th, and a month-end check on October 31, 2026 [1][3][4]. Polymarket lists an "end of October" event and an "end of December" event [2]. Each Kalshi contract resolves to Yes if the named company's model is the highest-ranked Chinese AI company model on Arena AI Text Score with style control removed, measured at 10:00am ET on the stated date [1][3][4]. The Polymarket October event uses the Text Arena Overall table with style control off, checked on October 31, 2026 at 12:00 PM ET [2]. The contracts differ in how they define a qualifying company. Kalshi requires a company whose global or primary operational headquarters is in mainland China [1]. Polymarket counts companies that are primarily Chinese and names Alibaba, Moonshot, Baidu, Z.ai, Xiaomi, DeepSeek, ByteDance, MiniMax, Meituan, Tencent, and StepFun as examples, while stating that the list is not exhaustive [2]. Polymarket excludes models marked AutoEval at the check time, ranks qualifying models by leaderboard rank, and uses Arena score and then alphabetical company order to break ties [2]. Kalshi applies the publisher's official tie-breaking method when one exists. If none exists, tied entities share the highest rank, and tied candidates divide the contract payout according to the number of tied candidates, rounded down [1]. Timing matters for reading these contracts. The provider observations in the evidence were recorded at 03:00 UTC on October 19, 2026, which is before the 10:00am ET check for the October 19 weekly Kalshi contract [1][3]. The saved end dates for the Kalshi weekly and monthly events are shown as 14:00 UTC on their respective dates, and Polymarket's October event lists an end time of 16:00 UTC on October 31, 2026 [1][2][3][4]. Kalshi's rules state that a market will close and expire early if the event occurs [1][3][4]. Any check results, final rankings, or settlements after the observation time are not part of this evidence. The saved market samples include every market recorded for the five events, according to the provider coverage. Kalshi's week of October 12th event has 10 markets, Polymarket's October event has 11, Kalshi's week of October 19th event has 10, Kalshi's monthly event has 9, and Polymarket's December event has 11 [1][2][3][4]. These counts describe the saved provider events only. The rankings and prices for different events are not combined here, because each event has its own rules, check time, and set of companies. The contracts measure a narrow outcome: which qualifying company's top model holds first place on one specified text leaderboard at one specified check time. They do not measure overall AI capability, company size, or product usage. Prices in these markets are observed snapshots of trading activity, not executable quotes or verified probabilities, and a difference in price between contracts on different events does not by itself indicate an opportunity.

Historical Context

Z.ai was formerly known as Zhipu AI outside China until 2025, according to its Wikipedia entry [5]. The same source states that it became China's first major LLM company to make an initial public offering, on the Hong Kong Stock Exchange in January 2026 [5]. The source reports a market capitalization of US$62 billion as of August 2026 [5].

Frequently Asked Questions