Anthropic leads trader sentiment for second place on the Code Arena WebDev leaderboard at end of September because OpenAI’s GPT-6 Astra claimed the top spot in early September with 1,797 points, 35 ahead of Anthropic’s Claude Fable 5.1 at 1,762. The crowdsourced Elo rankings, built on hundreds of thousands of votes for iterative frontend and agentic coding tasks, show Anthropic maintaining a clear gap over Alibaba’s Qwen variants, Moonshot’s Kimi models, and other labs on the Pareto frontier. Recent Claude releases demonstrated stronger multi-step reasoning and tool use in web development workflows, while OpenAI’s new model reset the top ranking without displacing Anthropic from a strong second. No major updates from competitors have closed that margin in the past week.
Eksperimental na AI-generated summary na nire-reference ang Polymarket data. Hindi ito trading advice at wala itong papel sa kung paano nire-resolve ang market na ito. · Na-updateSecond-best Code Arena WebDev AI Lab end of September?
Anthropic 70.1%
OpenAI 27.1%
Alibaba 2.7%
Moonshot <1%
$76,641 Vol.
$76,641 Vol.

Anthropic
70%

OpenAI
27%

Alibaba
3%

Moonshot
1%

SpaceXAI
1%

Z.ai
<1%

Tencent
<1%

Meta
<1%

ByteDance
<1%

MiniMax
<1%

<1%

Xiaomi
<1%

DeepSeek
<1%

Thinky
<1%

Poolside
<1%

Mistral
<1%
Anthropic 70.1%
OpenAI 27.1%
Alibaba 2.7%
Moonshot <1%
$76,641 Vol.
$76,641 Vol.

Anthropic
70%

OpenAI
27%

Alibaba
3%

Moonshot
1%

SpaceXAI
1%

Z.ai
<1%

Tencent
<1%

Meta
<1%

ByteDance
<1%

MiniMax
<1%

<1%

Xiaomi
<1%

DeepSeek
<1%

Thinky
<1%

Poolside
<1%

Mistral
<1%
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.
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".
Binuksan ang Market: Jul 24, 2026, 7:45 PM ET
Resolution Source
https://arena.ai/leaderboard/code/webdev?rankBy=labsResolver
0x69c47De9D...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.
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".
Resolution Source
https://arena.ai/leaderboard/code/webdev?rankBy=labsResolver
0x69c47De9D...Anthropic leads trader sentiment for second place on the Code Arena WebDev leaderboard at end of September because OpenAI’s GPT-6 Astra claimed the top spot in early September with 1,797 points, 35 ahead of Anthropic’s Claude Fable 5.1 at 1,762. The crowdsourced Elo rankings, built on hundreds of thousands of votes for iterative frontend and agentic coding tasks, show Anthropic maintaining a clear gap over Alibaba’s Qwen variants, Moonshot’s Kimi models, and other labs on the Pareto frontier. Recent Claude releases demonstrated stronger multi-step reasoning and tool use in web development workflows, while OpenAI’s new model reset the top ranking without displacing Anthropic from a strong second. No major updates from competitors have closed that margin in the past week.
Eksperimental na AI-generated summary na nire-reference ang Polymarket data. Hindi ito trading advice at wala itong papel sa kung paano nire-resolve ang market na ito. · Na-update
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