Anthropic leads market-implied odds for second place on Code Arena’s WebDev leaderboard by end of October, reflecting its consistent strength in agentic frontend coding tasks despite OpenAI’s GPT-6 Astra claiming the top spot with a 1,797 score shortly after its September 3 launch. The crowdsourced Elo system rewards iterative web-app building, tool use, and multi-step reasoning, where Anthropic’s Claude Fable 5.1 and Opus variants have historically clustered near the frontier. Traders appear to weigh OpenAI’s recent momentum against Anthropic’s depth in coding benchmarks and potential follow-on releases, while lower odds for labs like Alibaba, Moonshot, and Google reflect narrower gaps in recent votes and uncertainty over which models will gain traction through October. Upcoming model updates and sustained community voting will likely determine final positioning.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedAnthropic 58.9%
OpenAI 26%
Alibaba 7%
SpaceXAI 3.8%
$17,598 Vol.
$17,598 Vol.
Oct 31, 2026
Anthropic
59%
OpenAI
26%
Alibaba
7%
SpaceXAI
4%
2%
DeepSeek
2%
Moonshot
2%
Meta
2%
Z.ai
1%
Poolside
1%
Tencent
1%
Xiaomi
1%
Mistral
1%
Thinky
<1%
ByteDance
<1%
MiniMax
<1%
Anthropic 58.9%
OpenAI 26%
Alibaba 7%
SpaceXAI 3.8%
$17,598 Vol.
$17,598 Vol.
Oct 31, 2026
Anthropic
$2,706 Vol.
59%
OpenAI
$1,242 Vol.
26%
Alibaba
$1,737 Vol.
7%
SpaceXAI
$522 Vol.
4%
$601 Vol.
2%
DeepSeek
$568 Vol.
2%
Moonshot
$4,868 Vol.
2%
Meta
$641 Vol.
2%
Z.ai
$574 Vol.
1%
Poolside
$906 Vol.
1%
Tencent
$540 Vol.
1%
Xiaomi
$346 Vol.
1%
Mistral
$731 Vol.
1%
Thinky
$593 Vol.
<1%
ByteDance
$597 Vol.
<1%
MiniMax
$426 Vol.
<1%
This market will resolve according to the second-highest ranked Company based on the arena.ai Code Arena | WebDev Leaderboard when the table under "Code Arena | WebDev" filtered for "Labs" is checked on October 31, 2026, 12:00 PM ET.
Results from the "Lab Rank" column under the "Code Arena | WebDev" Leaderboard tab at https://arena.ai/leaderboard/code/webdev?rankBy=labs (Overall) filtered for "Labs" 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.
AI companies will be ordered primarily by their Lab Rank at the market’s check time. If the results based on the lab ranking are ambiguous or unavailable, the relevant AI companies will be ordered according to their highest-ranking AI model in the leaderboard’s “Models” view. 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 AI lab/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 second place under this ranking.
The resolution source for this market is the arena.ai Code Arena | WebDev Leaderboard. 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 leads market-implied odds for second place on Code Arena’s WebDev leaderboard by end of October, reflecting its consistent strength in agentic frontend coding tasks despite OpenAI’s GPT-6 Astra claiming the top spot with a 1,797 score shortly after its September 3 launch. The crowdsourced Elo system rewards iterative web-app building, tool use, and multi-step reasoning, where Anthropic’s Claude Fable 5.1 and Opus variants have historically clustered near the frontier. Traders appear to weigh OpenAI’s recent momentum against Anthropic’s depth in coding benchmarks and potential follow-on releases, while lower odds for labs like Alibaba, Moonshot, and Google reflect narrower gaps in recent votes and uncertainty over which models will gain traction through October. Upcoming model updates and sustained community voting will likely determine final positioning.
This market will resolve according to the second-highest ranked Company based on the arena.ai Code Arena | WebDev Leaderboard when the table under "Code Arena | WebDev" filtered for "Labs" is checked on October 31, 2026, 12:00 PM ET.
Results from the "Lab Rank" column under the "Code Arena | WebDev" Leaderboard tab at https://arena.ai/leaderboard/code/webdev?rankBy=labs (Overall) filtered for "Labs" 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.
AI companies will be ordered primarily by their Lab Rank at the market’s check time. If the results based on the lab ranking are ambiguous or unavailable, the relevant AI companies will be ordered according to their highest-ranking AI model in the leaderboard’s “Models” view. 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 AI lab/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 second place under this ranking.
The resolution source for this market is the arena.ai Code Arena | WebDev Leaderboard. 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 "Lab Rank" column under the "Code Arena | WebDev" Leaderboard tab at https://arena.ai/leaderboard/code/webdev?rankBy=labs (Overall) filtered for "Labs" 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.
AI companies will be ordered primarily by their Lab Rank at the market’s check time. If the results based on the lab ranking are ambiguous or unavailable, the relevant AI companies will be ordered according to their highest-ranking AI model in the leaderboard’s “Models” view. 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 AI lab/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 second place under this ranking.
The resolution source for this market is the arena.ai Code Arena | WebDev Leaderboard. 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, 7:56 PM ET
Volume
$17,598End Date
Nov 1, 2026Market Opened
Aug 12, 2026, 7:56 PM ETResolver
0x69c47De9D...This market will resolve according to the second-highest ranked Company based on the arena.ai Code Arena | WebDev Leaderboard when the table under "Code Arena | WebDev" filtered for "Labs" is checked on October 31, 2026, 12:00 PM ET.
Results from the "Lab Rank" column under the "Code Arena | WebDev" Leaderboard tab at https://arena.ai/leaderboard/code/webdev?rankBy=labs (Overall) filtered for "Labs" 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.
AI companies will be ordered primarily by their Lab Rank at the market’s check time. If the results based on the lab ranking are ambiguous or unavailable, the relevant AI companies will be ordered according to their highest-ranking AI model in the leaderboard’s “Models” view. 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 AI lab/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 second place under this ranking.
The resolution source for this market is the arena.ai Code Arena | WebDev Leaderboard. 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 leads market-implied odds for second place on Code Arena’s WebDev leaderboard by end of October, reflecting its consistent strength in agentic frontend coding tasks despite OpenAI’s GPT-6 Astra claiming the top spot with a 1,797 score shortly after its September 3 launch. The crowdsourced Elo system rewards iterative web-app building, tool use, and multi-step reasoning, where Anthropic’s Claude Fable 5.1 and Opus variants have historically clustered near the frontier. Traders appear to weigh OpenAI’s recent momentum against Anthropic’s depth in coding benchmarks and potential follow-on releases, while lower odds for labs like Alibaba, Moonshot, and Google reflect narrower gaps in recent votes and uncertainty over which models will gain traction through October. Upcoming model updates and sustained community voting will likely determine final positioning.
This market will resolve according to the second-highest ranked Company based on the arena.ai Code Arena | WebDev Leaderboard when the table under "Code Arena | WebDev" filtered for "Labs" is checked on October 31, 2026, 12:00 PM ET.
Results from the "Lab Rank" column under the "Code Arena | WebDev" Leaderboard tab at https://arena.ai/leaderboard/code/webdev?rankBy=labs (Overall) filtered for "Labs" 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.
AI companies will be ordered primarily by their Lab Rank at the market’s check time. If the results based on the lab ranking are ambiguous or unavailable, the relevant AI companies will be ordered according to their highest-ranking AI model in the leaderboard’s “Models” view. 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 AI lab/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 second place under this ranking.
The resolution source for this market is the arena.ai Code Arena | WebDev Leaderboard. 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 "Lab Rank" column under the "Code Arena | WebDev" Leaderboard tab at https://arena.ai/leaderboard/code/webdev?rankBy=labs (Overall) filtered for "Labs" 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.
AI companies will be ordered primarily by their Lab Rank at the market’s check time. If the results based on the lab ranking are ambiguous or unavailable, the relevant AI companies will be ordered according to their highest-ranking AI model in the leaderboard’s “Models” view. 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 AI lab/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 second place under this ranking.
The resolution source for this market is the arena.ai Code Arena | WebDev Leaderboard. 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
$17,598End Date
Nov 1, 2026Market Opened
Aug 12, 2026, 7:56 PM ETResolver
0x69c47De9D...Anthropic leads market-implied odds for second place on Code Arena’s WebDev leaderboard by end of October, reflecting its consistent strength in agentic frontend coding tasks despite OpenAI’s GPT-6 Astra claiming the top spot with a 1,797 score shortly after its September 3 launch. The crowdsourced Elo system rewards iterative web-app building, tool use, and multi-step reasoning, where Anthropic’s Claude Fable 5.1 and Opus variants have historically clustered near the frontier. Traders appear to weigh OpenAI’s recent momentum against Anthropic’s depth in coding benchmarks and potential follow-on releases, while lower odds for labs like Alibaba, Moonshot, and Google reflect narrower gaps in recent votes and uncertainty over which models will gain traction through October. Upcoming model updates and sustained community voting will likely determine final positioning.
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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