Anthropic holds an implied 78% probability as the second-best lab on Code Arena’s WebDev leaderboard by end-September because its Claude models, including the recently released Fable 5.1, have maintained strong community-voted Elo ratings and dominate independent coding benchmarks such as SWE-bench Verified (96% for Opus 5) and related agentic evaluations. OpenAI’s GPT-6 Astra overtook the top spot on September 5 with 1,797 points, 35 ahead of Claude Fable 5.1, shifting the contest to a clear first-versus-second dynamic while other labs remain far behind on the crowdsourced platform. Traders appear to view Anthropic’s model family depth, consistent performance across frontend-backend tasks, and rapid iteration cadence as sufficient to hold second place through the final weeks of voting, despite the possibility of further OpenAI updates or surges from Chinese labs narrowing the gap.
Résumé expérimental généré par IA à partir des données Polymarket. Ceci n'est pas un conseil de trading et ne joue aucun rôle dans la résolution de ce marché. · Mis à jourAnthropic 77.8%
OpenAI 18.2%
Alibaba 2.7%
Moonshot 2.4%
$68,573 Vol.
$68,573 Vol.

Anthropic
78%

OpenAI
18%

Alibaba
3%

Moonshot
2%

SpaceXAI
1%

Tencent
<1%

Z.ai
<1%

Meta
<1%

<1%

ByteDance
<1%

MiniMax
<1%

Xiaomi
<1%

DeepSeek
<1%

Thinky
<1%

Poolside
<1%

Mistral
<1%
Anthropic 77.8%
OpenAI 18.2%
Alibaba 2.7%
Moonshot 2.4%
$68,573 Vol.
$68,573 Vol.

Anthropic
78%

OpenAI
18%

Alibaba
3%

Moonshot
2%

SpaceXAI
1%

Tencent
<1%

Z.ai
<1%

Meta
<1%

<1%

ByteDance
<1%

MiniMax
<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".
Marché ouvert : Jul 24, 2026, 7:45 PM ET
Source de résolution
https://arena.ai/leaderboard/code/webdev?rankBy=labsRésolveur
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".
Source de résolution
https://arena.ai/leaderboard/code/webdev?rankBy=labsRésolveur
0x69c47De9D...Anthropic holds an implied 78% probability as the second-best lab on Code Arena’s WebDev leaderboard by end-September because its Claude models, including the recently released Fable 5.1, have maintained strong community-voted Elo ratings and dominate independent coding benchmarks such as SWE-bench Verified (96% for Opus 5) and related agentic evaluations. OpenAI’s GPT-6 Astra overtook the top spot on September 5 with 1,797 points, 35 ahead of Claude Fable 5.1, shifting the contest to a clear first-versus-second dynamic while other labs remain far behind on the crowdsourced platform. Traders appear to view Anthropic’s model family depth, consistent performance across frontend-backend tasks, and rapid iteration cadence as sufficient to hold second place through the final weeks of voting, despite the possibility of further OpenAI updates or surges from Chinese labs narrowing the gap.
Résumé expérimental généré par IA à partir des données Polymarket. Ceci n'est pas un conseil de trading et ne joue aucun rôle dans la résolution de ce marché. · Mis à jour
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