Recent releases have intensified competition on Code Arena WebDev, where OpenAI’s GPT-6 Astra recently claimed the top spot with strong agentic frontend and full-stack coding results, while Anthropic’s Claude Fable 5.1 series previously led and maintains close scores. Trader consensus around 30% implied probability for several labs—including Z.ai, Anthropic, MiniMax, and Google—reflects rapid iteration by Chinese developers on cost-efficient large language models that excel in multi-step web development tasks and Pareto-optimal pricing. Key swing factors include upcoming model updates, benchmark volatility in real-world HTML/React workflows, and whether open-weight contenders can sustain gains against proprietary frontier systems before November resolution.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedZ.ai 35%
MiniMax 29%
Poolside 24%
Anthropic 24%

Z.ai
35%

MiniMax
29%

Poolside
24%

Anthropic
24%

SpaceXAI
23%

OpenAI
21%

Meta
14%

13%

Xiaomi
13%

Thinky
11%

Moonshot
8%

Alibaba
26%

Mistral
24%

ByteDance
9%

DeepSeek
3%

Tencent
3%
Z.ai 35%
MiniMax 29%
Poolside 24%
Anthropic 24%

Z.ai
35%

MiniMax
29%

Poolside
24%

Anthropic
24%

SpaceXAI
23%

OpenAI
21%

Meta
14%

13%

Xiaomi
13%

Thinky
11%

Moonshot
8%

Alibaba
26%

Mistral
24%

ByteDance
9%

DeepSeek
3%

Tencent
3%
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: Sep 17, 2026, 8:13 PM ET
Resolver
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.
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".
Resolver
0x69c47De9D...Recent releases have intensified competition on Code Arena WebDev, where OpenAI’s GPT-6 Astra recently claimed the top spot with strong agentic frontend and full-stack coding results, while Anthropic’s Claude Fable 5.1 series previously led and maintains close scores. Trader consensus around 30% implied probability for several labs—including Z.ai, Anthropic, MiniMax, and Google—reflects rapid iteration by Chinese developers on cost-efficient large language models that excel in multi-step web development tasks and Pareto-optimal pricing. Key swing factors include upcoming model updates, benchmark volatility in real-world HTML/React workflows, and whether open-weight contenders can sustain gains against proprietary frontier systems before November resolution.
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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