An Anthropic model holds the top rank on the arena.ai Text Arena Overall leaderboard on October 31, 2026.
Market resolves based on whether an Anthropic model leads the LMSYS arena.ai Overall text leaderboard without style control at noon ET on October 31, 2026.
Across 6 frontier models answering independently, the panel thinks this is unlikely: the median is 27%.
They do not agree: Qwen puts it at 47% and Claude at 12%, 35 points apart. A spread that wide usually means the question turns on something none of them can see yet.
Traders risking real money on Polymarket land in the same place, at 26%.
Nothing is settled until 31 Oct 2026, when the outcome is checked against sources and every number above gets a permanent score.
- AI edge
- +1 pts
- Moved this week
- -63 pts
- Volume
- $270K
The panel and the market agree almost exactly — 27% against 26%.
What each one said
-
QwenAlibaba
Claude has held #1 before but faces OpenAI and Google releases that could displace it within a month.
- Anthropic's Claude 3.5 Sonnet and successors have repeatedly topped the LMSYS arena, so holding #1 is plausible but not guaranteed.
- OpenAI and Google both ship frontier models on roughly 6-12 month cycles; a new release before Oct 31 could leapfrog Claude.
- The leaderboard is volatile at the top—rank changes of 1-2 positions between close models happen within weeks of new releases.
47% -
GPTOpenAI
It turns on whether Anthropic ships a new frontier Claude that wins Arena before an OpenAI, Google, or xAI release displaces it.
- The check is only 30 days away, so the incumbent and any already-deployed model versions dominate the outcome.
- Arena leadership has rotated among a small set of frontier labs; Anthropic is a credible contender but not the modal single owner.
- A public Claude launch with a clear non-AutoEval Arena lead before October 31 would sharply raise this estimate.
29% -
GrokxAI
Whether Claude stays #1 or a late-Oct Anthropic drop outranks OpenAI/Google/xAI by noon ET 10/31.
- No public Anthropic launch is scheduled inside the 30-day window; new models need days of Arena votes to rank.
- Four labs rotate the top slot; Anthropic has held it ~25% of recent months, so 27 sits near that base.
- A surprise GPT or Grok update before 10/31 would most change the odds.
27% -
GeminiGoogle
The top slot routinely cycles among Anthropic, OpenAI, and Google, leaving Anthropic with roughly a quarter share at any random date.
- OpenAI, Google DeepMind, Anthropic, and open-weight giants leapfrog each other every 2 to 4 months on the LMSYS Elo ratings.
- Anthropic holds the crown roughly 20-30% of the time historically, with Claude 3.5 and 3.7 surges alternating with GPT and Gemini.
- A decisive Claude 4.5 or Opus release immediately before late October 2026 is required to fend off simultaneous OpenAI and Google models.
26% -
DeepSeekDeepSeek
Whether Gemini 3 or GPT-5.x ships before Halloween and knocks Anthropic off a perch it has held for months.
- Anthropic's Claude models have topped the no-style-control text arena for most of 2025, so the incumbent base rate is genuinely high.
- Google's Gemini 3 and OpenAI's next flagship are both rumored for late 2026, and either shipping in October would likely leapfrog Claude.
- Arena rank is decided by blind human votes, so a new entrant needs weeks of traffic to accumulate enough battles to displace the leader.
22% -
ClaudeAnthropic
Google's Gemini models have dominated the no-style-control arena leaderboard; Anthropic rarely tops it.
- Historically Gemini (and sometimes OpenAI/xAI) models have held top arena.ai rank, not Anthropic, which tends to rank lower without style control.
- Anthropic would need to release a new top-tier model and have it outrank aggressive competitors like Google's Gemini 3 or OpenAI's next release by Oct 31, 2026.
- Base rate for Anthropic leading this specific leaderboard over the past year is low, and no strong signal suggests an imminent shift.
12%
6 of 6 models answered · 35 points between the highest and lowest. None was shown the market price.
Resolution criteria
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 October 31, 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. Note: Models marked “AutoEval” at the applicable check time will not be considered, regardless of whether they display a rank or score. 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 still 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 “SpaceXAI”). This market will resolve based on the company that occupies first place under thi
Question sourced from Polymarket on 1 Oct 2026. Forecast by google/gemini-3.8-flash, anthropic/claude-sonnet-5, openai/gpt-5.6-terra, x-ai/grok-4.6, deepseek/deepseek-v4.1-flash, qwen/qwen3.8-max-0902 via OpenRouter.