Anthropic’s dominance on the arena.ai Text Arena leaderboard under style control—where response length, markdown, and formatting are adjusted to isolate substance—drives the 85% market-implied probability it holds the top model by end-October 2026. Its Claude Fable 5, Mythos 5, and Opus 5 variants lead multiple independent benchmarks (BenchLM, Artificial Analysis, LMArena Elo) with the highest scores in reasoning, coding, and agentic tasks as of late August, reflecting sustained post-training gains and a 1M-token context window that competitors have not matched. OpenAI’s GPT-5.6 family, Google’s Gemini 3.x releases, and Meta’s Muse Spark updates have narrowed some gaps on specific metrics but remain several points behind on style-controlled human-preference rankings, while Chinese labs like Alibaba, Moonshot, and Z.ai trail further. With only two months until resolution and no announced frontier breakthroughs from rivals, traders see limited near-term catalysts capable of displacing Anthropic’s current lead.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedAnthropic 85%
Meta 4.3%
Google 4.3%
OpenAI 2.9%
$14,683 Vol.
$14,683 Vol.
Oct 31, 2026
Anthropic
85%
Meta
4%
4%
OpenAI
3%
Alibaba
2%
Moonshot
1%
Z.ai
1%
Xiaomi
1%
Tencent
1%
Microsoft
1%
SpaceXAI
1%
DeepSeek
1%
ByteDance
1%
MiniMax
1%
Meituan
1%
StepFun
<1%
Nvidia
<1%
Baidu
<1%
Thinky
<1%
Mistral
<1%
Amazon
<1%
Anthropic 85%
Meta 4.3%
Google 4.3%
OpenAI 2.9%
$14,683 Vol.
$14,683 Vol.
Oct 31, 2026
Anthropic
$9,572 Vol.
85%
Meta
$229 Vol.
4%
$209 Vol.
4%
OpenAI
$239 Vol.
3%
Alibaba
$287 Vol.
2%
Moonshot
$319 Vol.
1%
Z.ai
$327 Vol.
1%
Xiaomi
$383 Vol.
1%
Tencent
$247 Vol.
1%
Microsoft
$245 Vol.
1%
SpaceXAI
$209 Vol.
1%
DeepSeek
$269 Vol.
1%
ByteDance
$263 Vol.
1%
MiniMax
$290 Vol.
1%
Meituan
$247 Vol.
1%
StepFun
$248 Vol.
<1%
Nvidia
$243 Vol.
<1%
Baidu
$119 Vol.
<1%
Thinky
$247 Vol.
<1%
Mistral
$249 Vol.
<1%
Amazon
$243 Vol.
<1%
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) (Style Control On) 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 with style control on (Adjustments: Style Control) 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 this ranking.
The resolution source for this market is the arena.ai Text Arena (Overall). 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 to "Other".Anthropic’s dominance on the arena.ai Text Arena leaderboard under style control—where response length, markdown, and formatting are adjusted to isolate substance—drives the 85% market-implied probability it holds the top model by end-October 2026. Its Claude Fable 5, Mythos 5, and Opus 5 variants lead multiple independent benchmarks (BenchLM, Artificial Analysis, LMArena Elo) with the highest scores in reasoning, coding, and agentic tasks as of late August, reflecting sustained post-training gains and a 1M-token context window that competitors have not matched. OpenAI’s GPT-5.6 family, Google’s Gemini 3.x releases, and Meta’s Muse Spark updates have narrowed some gaps on specific metrics but remain several points behind on style-controlled human-preference rankings, while Chinese labs like Alibaba, Moonshot, and Z.ai trail further. With only two months until resolution and no announced frontier breakthroughs from rivals, traders see limited near-term catalysts capable of displacing Anthropic’s current lead.
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) (Style Control On) 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 with style control on (Adjustments: Style Control) 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 this ranking.
The resolution source for this market is the arena.ai Text Arena (Overall). 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 to "Other".
Results from the "Rank" column under the "Text Arena | Overall" Leaderboard tab at https://arena.ai/leaderboard/text/overall with style control on (Adjustments: Style Control) 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 this ranking.
The resolution source for this market is the arena.ai Text Arena (Overall). 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 to "Other".
Market Opened: Aug 12, 2026, 8:03 PM ET
Volume
$14,683End Date
Oct 31, 2026Market Opened
Aug 12, 2026, 8:03 PM ETResolver
0x69c47De9D...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) (Style Control On) 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 with style control on (Adjustments: Style Control) 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 this ranking.
The resolution source for this market is the arena.ai Text Arena (Overall). 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 to "Other".Anthropic’s dominance on the arena.ai Text Arena leaderboard under style control—where response length, markdown, and formatting are adjusted to isolate substance—drives the 85% market-implied probability it holds the top model by end-October 2026. Its Claude Fable 5, Mythos 5, and Opus 5 variants lead multiple independent benchmarks (BenchLM, Artificial Analysis, LMArena Elo) with the highest scores in reasoning, coding, and agentic tasks as of late August, reflecting sustained post-training gains and a 1M-token context window that competitors have not matched. OpenAI’s GPT-5.6 family, Google’s Gemini 3.x releases, and Meta’s Muse Spark updates have narrowed some gaps on specific metrics but remain several points behind on style-controlled human-preference rankings, while Chinese labs like Alibaba, Moonshot, and Z.ai trail further. With only two months until resolution and no announced frontier breakthroughs from rivals, traders see limited near-term catalysts capable of displacing Anthropic’s current lead.
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) (Style Control On) 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 with style control on (Adjustments: Style Control) 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 this ranking.
The resolution source for this market is the arena.ai Text Arena (Overall). 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 to "Other".
Results from the "Rank" column under the "Text Arena | Overall" Leaderboard tab at https://arena.ai/leaderboard/text/overall with style control on (Adjustments: Style Control) 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 this ranking.
The resolution source for this market is the arena.ai Text Arena (Overall). 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 to "Other".
Volume
$14,683End Date
Oct 31, 2026Market Opened
Aug 12, 2026, 8:03 PM ETResolver
0x69c47De9D...Anthropic’s dominance on the arena.ai Text Arena leaderboard under style control—where response length, markdown, and formatting are adjusted to isolate substance—drives the 85% market-implied probability it holds the top model by end-October 2026. Its Claude Fable 5, Mythos 5, and Opus 5 variants lead multiple independent benchmarks (BenchLM, Artificial Analysis, LMArena Elo) with the highest scores in reasoning, coding, and agentic tasks as of late August, reflecting sustained post-training gains and a 1M-token context window that competitors have not matched. OpenAI’s GPT-5.6 family, Google’s Gemini 3.x releases, and Meta’s Muse Spark updates have narrowed some gaps on specific metrics but remain several points behind on style-controlled human-preference rankings, while Chinese labs like Alibaba, Moonshot, and Z.ai trail further. With only two months until resolution and no announced frontier breakthroughs from rivals, traders see limited near-term catalysts capable of displacing Anthropic’s current lead.
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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