Anthropic leads market-implied odds at 78% for the best AI agent by end of October due to its rapid rollout of production-ready agent frameworks and model upgrades. In early September 2026, the company released Claude Fable 5.1 and Mythos 5.1 alongside an Apache-2.0 commerce-agents blueprint and a Model Hardware Standard preview enabling agents to control physical lab and manufacturing devices. These build on Claude Code's dominance in autonomous coding workflows and recent Slack agent enhancements for proactive, context-aware operation. OpenAI trails at 19% despite Codex and ChatGPT Work expansions, as traders view Anthropic's tool-use reliability, long-horizon coherence, and safety controls as stronger differentiators ahead of the October cutoff.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedAnthropic 77%
OpenAI 20%
Z.ai 1.0%
Meta <1%
$18,852 Vol.
$18,852 Vol.
Oct 31, 2026
Anthropic
77%
OpenAI
20%
Z.ai
1%
Meta
1%
Moonshot
1%
SpaceXAI
1%
Alibaba
<1%
DeepSeek
<1%
Xiaomi
<1%
ByteDance
<1%
Mistral
<1%
Microsoft
<1%
<1%
Nvidia
<1%
Amazon
<1%
MiniMax
<1%
Meituan
<1%
Baidu
<1%
Anthropic 77%
OpenAI 20%
Z.ai 1.0%
Meta <1%
$18,852 Vol.
$18,852 Vol.
Oct 31, 2026
Anthropic
$10,002 Vol.
77%
OpenAI
$1,602 Vol.
20%
Z.ai
$372 Vol.
1%
Meta
$618 Vol.
1%
Moonshot
$466 Vol.
1%
SpaceXAI
$470 Vol.
1%
Alibaba
$335 Vol.
<1%
DeepSeek
$439 Vol.
<1%
Xiaomi
$456 Vol.
<1%
ByteDance
$464 Vol.
<1%
Mistral
$454 Vol.
<1%
Microsoft
$454 Vol.
<1%
$440 Vol.
<1%
Nvidia
$464 Vol.
<1%
Amazon
$490 Vol.
<1%
MiniMax
$487 Vol.
<1%
Meituan
$502 Vol.
<1%
Baidu
$335 Vol.
<1%
This market will resolve according to the company that owns the model that has the highest rank based on the Agent Arena Leaderboard (https://arena.ai/leaderboard/agent) when the table under "Agent Arena" filtered for "Models" is checked on October 31, 2026, 12:00 PM ET.
Results from the "Rank" column under the "Agent Arena" Leaderboard tab at https://arena.ai/leaderboard/agent 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 which model is listed higher on 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., “Google” would be ranked ahead of “SpaceXAI”). This market will resolve based on the company that occupies first place under this ranking.
The resolution source for this market is the Agent Arena Leaderboard found at https://arena.ai/leaderboard/agent. If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and will resolve based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve based on another resolution source.Anthropic leads market-implied odds at 78% for the best AI agent by end of October due to its rapid rollout of production-ready agent frameworks and model upgrades. In early September 2026, the company released Claude Fable 5.1 and Mythos 5.1 alongside an Apache-2.0 commerce-agents blueprint and a Model Hardware Standard preview enabling agents to control physical lab and manufacturing devices. These build on Claude Code's dominance in autonomous coding workflows and recent Slack agent enhancements for proactive, context-aware operation. OpenAI trails at 19% despite Codex and ChatGPT Work expansions, as traders view Anthropic's tool-use reliability, long-horizon coherence, and safety controls as stronger differentiators ahead of the October cutoff.
This market will resolve according to the company that owns the model that has the highest rank based on the Agent Arena Leaderboard (https://arena.ai/leaderboard/agent) when the table under "Agent Arena" filtered for "Models" is checked on October 31, 2026, 12:00 PM ET.
Results from the "Rank" column under the "Agent Arena" Leaderboard tab at https://arena.ai/leaderboard/agent 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 which model is listed higher on 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., “Google” would be ranked ahead of “SpaceXAI”). This market will resolve based on the company that occupies first place under this ranking.
The resolution source for this market is the Agent Arena Leaderboard found at https://arena.ai/leaderboard/agent. If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and will resolve based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve based on another resolution source.
Results from the "Rank" column under the "Agent Arena" Leaderboard tab at https://arena.ai/leaderboard/agent 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 which model is listed higher on 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., “Google” would be ranked ahead of “SpaceXAI”). This market will resolve based on the company that occupies first place under this ranking.
The resolution source for this market is the Agent Arena Leaderboard found at https://arena.ai/leaderboard/agent. If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and will resolve based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve based on another resolution source.
Market Opened: Aug 12, 2026, 7:52 PM ET
Volume
$18,852End Date
Nov 1, 2026Market Opened
Aug 12, 2026, 7:52 PM ETResolver
0x69c47De9D...This market will resolve according to the company that owns the model that has the highest rank based on the Agent Arena Leaderboard (https://arena.ai/leaderboard/agent) when the table under "Agent Arena" filtered for "Models" is checked on October 31, 2026, 12:00 PM ET.
Results from the "Rank" column under the "Agent Arena" Leaderboard tab at https://arena.ai/leaderboard/agent 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 which model is listed higher on 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., “Google” would be ranked ahead of “SpaceXAI”). This market will resolve based on the company that occupies first place under this ranking.
The resolution source for this market is the Agent Arena Leaderboard found at https://arena.ai/leaderboard/agent. If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and will resolve based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve based on another resolution source.Anthropic leads market-implied odds at 78% for the best AI agent by end of October due to its rapid rollout of production-ready agent frameworks and model upgrades. In early September 2026, the company released Claude Fable 5.1 and Mythos 5.1 alongside an Apache-2.0 commerce-agents blueprint and a Model Hardware Standard preview enabling agents to control physical lab and manufacturing devices. These build on Claude Code's dominance in autonomous coding workflows and recent Slack agent enhancements for proactive, context-aware operation. OpenAI trails at 19% despite Codex and ChatGPT Work expansions, as traders view Anthropic's tool-use reliability, long-horizon coherence, and safety controls as stronger differentiators ahead of the October cutoff.
This market will resolve according to the company that owns the model that has the highest rank based on the Agent Arena Leaderboard (https://arena.ai/leaderboard/agent) when the table under "Agent Arena" filtered for "Models" is checked on October 31, 2026, 12:00 PM ET.
Results from the "Rank" column under the "Agent Arena" Leaderboard tab at https://arena.ai/leaderboard/agent 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 which model is listed higher on 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., “Google” would be ranked ahead of “SpaceXAI”). This market will resolve based on the company that occupies first place under this ranking.
The resolution source for this market is the Agent Arena Leaderboard found at https://arena.ai/leaderboard/agent. If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and will resolve based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve based on another resolution source.
Results from the "Rank" column under the "Agent Arena" Leaderboard tab at https://arena.ai/leaderboard/agent 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 which model is listed higher on 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., “Google” would be ranked ahead of “SpaceXAI”). This market will resolve based on the company that occupies first place under this ranking.
The resolution source for this market is the Agent Arena Leaderboard found at https://arena.ai/leaderboard/agent. If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and will resolve based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve based on another resolution source.
Volume
$18,852End Date
Nov 1, 2026Market Opened
Aug 12, 2026, 7:52 PM ETResolver
0x69c47De9D...Anthropic leads market-implied odds at 78% for the best AI agent by end of October due to its rapid rollout of production-ready agent frameworks and model upgrades. In early September 2026, the company released Claude Fable 5.1 and Mythos 5.1 alongside an Apache-2.0 commerce-agents blueprint and a Model Hardware Standard preview enabling agents to control physical lab and manufacturing devices. These build on Claude Code's dominance in autonomous coding workflows and recent Slack agent enhancements for proactive, context-aware operation. OpenAI trails at 19% despite Codex and ChatGPT Work expansions, as traders view Anthropic's tool-use reliability, long-horizon coherence, and safety controls as stronger differentiators ahead of the October cutoff.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
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