Best AI Model 2026 is the year-end leaderboard market on which lab holds the top-ranked large language model on December 31, 2026. Anthropic's Claude remains the runaway favorite, but the challenger tier has reshuffled since midsummer: xAI's Grok has climbed past OpenAI's ChatGPT and Google's Gemini into second. The board spans 15 named contenders and roughly $9.7M in cumulative volume across Kalshi and Polymarket, and settles on the LM Arena leaderboard. The live board above ranks the current cross-platform prices for every model in the race.
Best AI Model 2026 is the year-end market on which lab holds the top-ranked large language model when the clock runs out on December 31, 2026. It is a single consolidated board covering 15 named contenders across Kalshi and Polymarket, from the frontier labs down to the Chinese open-weight challengers, with roughly $9.7M in cumulative volume behind it. Anthropic's Claude is still the runaway favorite. Behind it the order has changed: xAI's Grok has moved ahead of both OpenAI's ChatGPT and Google's Gemini since midsummer. The live board above ranks the current cross-platform prices.
Anthropic's Claude is the chalk on the Best AI Model 2026 board, and it is not close. Kalshi and Polymarket price Claude within a point of each other, and the Claude contract alone carries about $2.1M of the board's cumulative volume, more than any other name on it. When two independent venues converge on the same number for the same question and the deepest book on the board sits on that number, the read is a market with real conviction rather than one thin quote setting the tone.
Claude's position rests on holding the top of the LM Arena text leaderboard, the benchmark this market settles against. Anthropic has defended that spot through the first eight months of 2026, and the market has priced the lead slightly higher since midsummer, not lower. The year-end contract is still the harder question. Roughly four and a half months of releases from OpenAI, Google and xAI stand between now and settlement, and the leaderboard has changed hands before.
The clearest change on the Best AI Model 2026 board since midsummer is the order behind Claude. In July the market treated ChatGPT and Gemini as co-second favorites with Grok a step back. That has inverted. xAI's Grok now prices ahead of ChatGPT, and Gemini has slid to fourth at roughly half the price the market gave it in July.
The volume does not follow the price, which is what makes the reshuffle worth reading. ChatGPT carries about $1.7M in cumulative volume and Gemini about $1.4M, level with or ahead of Grok's book, so this is a repricing of three heavily traded contracts rather than one lightly traded name drifting on a handful of fills. All four of the top names now carry two-book lines as well: Gemini's Polymarket contract, closed back in July, is quoted again, so Kalshi and Polymarket both price the entire top tier.
On the question that matters, the three sit in the same tier. Each has the resources and the release cadence to top the LM Arena leaderboard in any given month, and each is priced long enough that the market is calling an upset rather than a coin flip.
Behind the top four, Meta's LLaMA is the next name on the Best AI Model 2026 board and the last one the market gives more than a token price. LLaMA quotes on both Kalshi and Polymarket and carries close to $1M in cumulative volume, heavy traffic for a contract the market does not expect to resolve YES. A standout frontier release from Meta before December is what that volume is paying for.
The rest of the field is the floor tier: Alibaba's Qwen, DeepSeek, Kimi, Moonshot AI, Baidu's Ernie, Microsoft, Amazon, ByteDance, Mistral and Meituan. Several of these list on only one of the two venues, so a blank price on the other book means there is no contract there, not a mispriced one. For any of them to resolve the market, the LM Arena ranking would need a shakeup no frontier lab has produced in 2026. They are on the board because the market lists every contender, not because the price says one is arriving.
The Best AI Model 2026 market resolves on December 31, 2026, to the company whose large language model holds the top position on the LM Arena leaderboard, the successor to Chatbot Arena. Kalshi's KXLLM1 year-end series settles on the LM Arena text ranking with Style Controls removed, ordered by Rank (UB). If two models tie, the higher Arena Score wins, then the model with more votes, then the earlier release date. Each company contract pays $1 per share if that company owns the top-ranked model on the resolution date, and $0 otherwise. The metric is the public leaderboard standing on the final day of the year, not a cumulative average across 2026.
Several forces will decide where the Best AI Model 2026 market settles:
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Resolves December 31, 2026 to the company whose large language model holds the top position on the LM Arena leaderboard, the successor to Chatbot Arena. Kalshi's KXLLM1 year-end series settles on the LM Arena text ranking with Style Controls removed, ordered by Rank (UB). Ties break to the model with the higher Arena Score, then the most votes, then the earlier release date. Each company contract pays $1 per share if that company holds the top-ranked model on the resolution date; all other contracts resolve to $0. The source of truth is the public leaderboard standing on the final day of 2026, not a cumulative average across the year.
As of August 17, 2026, Claude is the favorite at 69c on Kalshi and 68c on Polymarket. Grok is second near 12c, ChatGPT third near 11c and Gemini fourth at 7c on both books. The live board above shows current cross-platform prices for all 15 contenders.
It resolves on December 31, 2026, based on which company holds the top-ranked large language model on the LM Arena leaderboard on that date.
The market trades on Kalshi under the KXLLM1 year-end series and on Polymarket as the end-of-2026 best AI model event. Every name in the top tier, Gemini now included, carries a two-book cross-platform price, while several floor-tier contenders list on only one of the two venues.
Anthropic's Claude is the runaway favorite. As of August 17, 2026, it trades at 69c on Kalshi and 68c on Polymarket, roughly six times the price of the next name on the board, xAI's Grok.
Watch whether Grok's climb past ChatGPT and Gemini extends, and whether a late-2026 frontier release from OpenAI, Google or xAI passes Claude on the LM Arena text leaderboard. The December 31, 2026 snapshot rewards whoever sits on top on the final day, so a model shipped in the last weeks of the year can decide the market.