Anthropic holds an overwhelming 78% market-implied probability of finishing second on the Code Arena WebDev leaderboard by September 30 because its Claude Fable 5.1 model currently sits just 35 points behind OpenAI’s newly launched GPT-6 Astra, which claimed first place with 1,797 points on September 5. Recent benchmark data show Anthropic models maintaining elite agentic coding performance on frontend workflows, multi-step reasoning, and tool use, consistent with strong SWE-bench and CursorBench results through the summer. OpenAI’s rapid leaderboard jump after the Astra release has solidified the current ordering, while trailing labs such as Alibaba, Moonshot, and others remain well behind with limited momentum in the final weeks. Resolution hinges on the arena.ai lab-filtered ranking at month-end, where small score shifts could still occur but appear unlikely to displace Anthropic from second.
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?
Second-best Code Arena WebDev AI Lab end of September?
Anthropic 78.5%
OpenAI 17.5%
Alibaba 2.9%
Moonshot 2.7%
$67,734 Vol.
$67,734 Vol.
Sep 30, 2026
Anthropic
79%
OpenAI
18%
Alibaba
3%
Moonshot
3%
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 78.5%
OpenAI 17.5%
Alibaba 2.9%
Moonshot 2.7%
$67,734 Vol.
$67,734 Vol.
Sep 30, 2026
Anthropic
$13,398 Vol.
79%
OpenAI
$7,877 Vol.
18%
Alibaba
$16,842 Vol.
3%
Moonshot
$12,017 Vol.
3%
SpaceXAI
$2,214 Vol.
1%
Tencent
$1,650 Vol.
1%
Z.ai
$1,770 Vol.
<1%
Meta
$1,482 Vol.
<1%
$1,560 Vol.
<1%
ByteDance
$3,054 Vol.
<1%
MiniMax
$598 Vol.
<1%
Xiaomi
$1,468 Vol.
<1%
DeepSeek
$1,022 Vol.
<1%
Thinky
$617 Vol.
<1%
Poolside
$1,035 Vol.
<1%
Mistral
$1,130 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 September 30, 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.
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 holds an overwhelming 78% market-implied probability of finishing second on the Code Arena WebDev leaderboard by September 30 because its Claude Fable 5.1 model currently sits just 35 points behind OpenAI’s newly launched GPT-6 Astra, which claimed first place with 1,797 points on September 5. Recent benchmark data show Anthropic models maintaining elite agentic coding performance on frontend workflows, multi-step reasoning, and tool use, consistent with strong SWE-bench and CursorBench results through the summer. OpenAI’s rapid leaderboard jump after the Astra release has solidified the current ordering, while trailing labs such as Alibaba, Moonshot, and others remain well behind with limited momentum in the final weeks. Resolution hinges on the arena.ai lab-filtered ranking at month-end, where small score shifts could still occur but appear unlikely to displace Anthropic from second.
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 September 30, 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.
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.
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
Volume
$67,734Petsa ng Pagtatapos
Oct 1, 2026Binuksan ang Market
Jul 24, 2026, 7:45 PM ETResolution Source
https://arena.ai/leaderboard/code/webdev?rankBy=labsResolver
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 September 30, 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.
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 holds an overwhelming 78% market-implied probability of finishing second on the Code Arena WebDev leaderboard by September 30 because its Claude Fable 5.1 model currently sits just 35 points behind OpenAI’s newly launched GPT-6 Astra, which claimed first place with 1,797 points on September 5. Recent benchmark data show Anthropic models maintaining elite agentic coding performance on frontend workflows, multi-step reasoning, and tool use, consistent with strong SWE-bench and CursorBench results through the summer. OpenAI’s rapid leaderboard jump after the Astra release has solidified the current ordering, while trailing labs such as Alibaba, Moonshot, and others remain well behind with limited momentum in the final weeks. Resolution hinges on the arena.ai lab-filtered ranking at month-end, where small score shifts could still occur but appear unlikely to displace Anthropic from second.
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 September 30, 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.
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.
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
$67,734Petsa ng Pagtatapos
Oct 1, 2026Binuksan ang Market
Jul 24, 2026, 7:45 PM ETResolution Source
https://arena.ai/leaderboard/code/webdev?rankBy=labsResolver
0x69c47De9D...Anthropic holds an overwhelming 78% market-implied probability of finishing second on the Code Arena WebDev leaderboard by September 30 because its Claude Fable 5.1 model currently sits just 35 points behind OpenAI’s newly launched GPT-6 Astra, which claimed first place with 1,797 points on September 5. Recent benchmark data show Anthropic models maintaining elite agentic coding performance on frontend workflows, multi-step reasoning, and tool use, consistent with strong SWE-bench and CursorBench results through the summer. OpenAI’s rapid leaderboard jump after the Astra release has solidified the current ordering, while trailing labs such as Alibaba, Moonshot, and others remain well behind with limited momentum in the final weeks. Resolution hinges on the arena.ai lab-filtered ranking at month-end, where small score shifts could still occur but appear unlikely to displace Anthropic from second.
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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