{
  "_notice": {
    "type": "free_key_offer",
    "message": "Free and anonymous access is staying. If this endpoint is in your pipeline, a free key adds advance notice before any schema change or deprecation. POST /v1/keys {\"email\": \"you@firm.com\"} — nothing else required. Something broken or missing? hello@clearmarket.fyi reaches a human.",
    "docs": "https://clearmarket.fyi/for-data/",
    "policy": "This field is additive and its shape will not change."
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  "event_id": "CM-EVT-30R2VZMD50",
  "slug": "which-company-has-the-best-code-arena-webdev-ai-model-end-of-september-20260717140116512",
  "question": "Will the best Code Arena WebDev AI model at the end of September be from a single company?",
  "category": "technology",
  "event_type": "BINARY",
  "ladder_distribution": null,
  "tags": [
    "technology",
    "ai",
    "tech",
    "code-arena",
    "webdev-benchmark",
    "ai-model-competition"
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  "catalyst_types": [],
  "catalyst_dates": [],
  "editorial_notes": "This event tracks which company holds the top-ranked model on arena.ai's Code Arena WebDev leaderboard at end of September 2026. Polymarket structures this as a mutually exclusive set of binary outcome markets, one per named company. Each contract resolves via Polymarket's UMA Optimistic Oracle against the arena.ai Models filter ranking snapshot. Positions across all legs must sum to one, so relative pricing reflects implied probability of each lab's dominance.",
  "venues_covered": [
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  "primary_market_id": "CM-MKT-GTJ3GH02C0",
  "current_primary_mark": {
    "last_price": 0.111,
    "implied_probability": 0.111
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  "created_at": "2026-08-04T20:03:51.865287+00:00",
  "updated_at": "2026-08-04T20:03:51.865287+00:00",
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      "event_id": "CM-EVT-30R2VZMD50",
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      "platform_market_id": "0x613bb9bf29cd0934a6270f7bd58ac877f30271ce85476a4b1081b19e9a25bb31",
      "question": "Will Moonshot have the best Code Arena | WebDev AI at the end of September 2026?",
      "description": "This market will resolve according to the company that owns the model that has the highest rank based on the arena.ai Code Arena | WebDev Leaderboard when the table under \"Code Arena | WebDev\" filtered for \"Models\" is checked on September 30, 2026, 12:00 PM ET.\n\nResults from the \"Rank\" column under the \"Code Arena | WebDev\" Leaderboard tab at https://arena.ai/leaderboard/code/webdev (Overall) filtered for \"Models\" will be used to resolve this market.\n\nModels will be ordered primarily by their leaderboard rank at the market’s check time. If two or more models are tied on rank, they will be orde",
      "contract_type": "binary",
      "settlement_currency": "USDC",
      "underlying_reference": "Moonshot: The company owning the highest-ranked model on arena.ai's Code Arena | WebDev Leaderboard (Models filter) at September 30, 2026, 12:00 PM ET resolves the outcome.",
      "close_at": "2026-09-30T23:59:00Z",
      "resolve_at": "2026-09-30T23:59:00Z",
      "status": "open",
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        "rules_raw": "This market will resolve according to the company that owns the model that has the highest rank based on the arena.ai Code Arena | WebDev Leaderboard when the table under \"Code Arena | WebDev\" filtered for \"Models\" is checked on September 30, 2026, 12:00 PM ET.\n\nResults from the \"Rank\" column under the \"Code Arena | WebDev\" Leaderboard tab at https://arena.ai/leaderboard/code/webdev (Overall) filtered for \"Models\" will be used to resolve this market.\n\nModels will be ordered primarily by their leaderboard rank at the market’s check time. 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 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 first place under this ranking.\n\nThe 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\".",
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      "question": "Will Anthropic have the best Code Arena | WebDev AI at the end of September 2026?",
      "description": "This market will resolve according to the company that owns the model that has the highest rank based on the arena.ai Code Arena | WebDev Leaderboard when the table under \"Code Arena | WebDev\" filtered for \"Models\" is checked on September 30, 2026, 12:00 PM ET.\n\nResults from the \"Rank\" column under the \"Code Arena | WebDev\" Leaderboard tab at https://arena.ai/leaderboard/code/webdev (Overall) filtered for \"Models\" will be used to resolve this market.\n\nModels will be ordered primarily by their leaderboard rank at the market’s check time. If two or more models are tied on rank, they will be orde",
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      "underlying_reference": "Anthropic: The company owning the highest-ranked model on arena.ai's Code Arena | WebDev Leaderboard (Models filter) at September 30, 2026, 12:00 PM ET resolves the outcome.",
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      "last_price": 0.69,
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    {
      "market_id": "CM-MKT-LRZSTRGFP1",
      "event_id": "CM-EVT-30R2VZMD50",
      "platform": "polymarket",
      "platform_market_id": "0x13a7d5db6d842cf3e345589975ba1fc4abf161457bcef3b37e847999df119644",
      "question": "Will OpenAI have the best Code Arena | WebDev AI at the end of September 2026?",
      "description": "This market will resolve according to the company that owns the model that has the highest rank based on the arena.ai Code Arena | WebDev Leaderboard when the table under \"Code Arena | WebDev\" filtered for \"Models\" is checked on September 30, 2026, 12:00 PM ET.\n\nResults from the \"Rank\" column under the \"Code Arena | WebDev\" Leaderboard tab at https://arena.ai/leaderboard/code/webdev (Overall) filtered for \"Models\" will be used to resolve this market.\n\nModels will be ordered primarily by their leaderboard rank at the market’s check time. If two or more models are tied on rank, they will be orde",
      "contract_type": "binary",
      "settlement_currency": "USDC",
      "underlying_reference": "OpenAI: The company owning the highest-ranked model on arena.ai's Code Arena | WebDev Leaderboard (Models filter) at September 30, 2026, 12:00 PM ET resolves the outcome.",
      "close_at": "2026-09-30T23:59:00Z",
      "resolve_at": "2026-09-30T23:59:00Z",
      "status": "open",
      "resolution": {
        "rules_raw": "This market will resolve according to the company that owns the model that has the highest rank based on the arena.ai Code Arena | WebDev Leaderboard when the table under \"Code Arena | WebDev\" filtered for \"Models\" is checked on September 30, 2026, 12:00 PM ET.\n\nResults from the \"Rank\" column under the \"Code Arena | WebDev\" Leaderboard tab at https://arena.ai/leaderboard/code/webdev (Overall) filtered for \"Models\" will be used to resolve this market.\n\nModels will be ordered primarily by their leaderboard rank at the market’s check time. 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 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 first place under this ranking.\n\nThe 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\".",
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      "platform_market_id": "0x705345ae5a976925f84e21499f8373452d78ac4c85f253f7a69118a3e646ff3a",
      "question": "Will Z.ai have the best Code Arena | WebDev AI at the end of September 2026?",
      "description": "This market will resolve according to the company that owns the model that has the highest rank based on the arena.ai Code Arena | WebDev Leaderboard when the table under \"Code Arena | WebDev\" filtered for \"Models\" is checked on September 30, 2026, 12:00 PM ET.\n\nResults from the \"Rank\" column under the \"Code Arena | WebDev\" Leaderboard tab at https://arena.ai/leaderboard/code/webdev (Overall) filtered for \"Models\" will be used to resolve this market.\n\nModels will be ordered primarily by their leaderboard rank at the market’s check time. If two or more models are tied on rank, they will be orde",
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      "platform_market_id": "0x308c0f1e3053f7f855b58a2e0342ce06e817c914ef32fb8b5503c4d3244fcb11",
      "question": "Will SpaceXAI have the best Code Arena | WebDev AI at the end of September 2026?",
      "description": "This market will resolve according to the company that owns the model that has the highest rank based on the arena.ai Code Arena | WebDev Leaderboard when the table under \"Code Arena | WebDev\" filtered for \"Models\" is checked on September 30, 2026, 12:00 PM ET.\n\nResults from the \"Rank\" column under the \"Code Arena | WebDev\" Leaderboard tab at https://arena.ai/leaderboard/code/webdev (Overall) filtered for \"Models\" will be used to resolve this market.\n\nModels will be ordered primarily by their leaderboard rank at the market’s check time. If two or more models are tied on rank, they will be orde",
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      "status": "open",
      "resolution": {
        "rules_raw": "This market will resolve according to the company that owns the model that has the highest rank based on the arena.ai Code Arena | WebDev Leaderboard when the table under \"Code Arena | WebDev\" filtered for \"Models\" is checked on September 30, 2026, 12:00 PM ET.\n\nResults from the \"Rank\" column under the \"Code Arena | WebDev\" Leaderboard tab at https://arena.ai/leaderboard/code/webdev (Overall) filtered for \"Models\" will be used to resolve this market.\n\nModels will be ordered primarily by their leaderboard rank at the market’s check time. 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 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 first place under this ranking.\n\nThe 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\".",
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      "question": "Will Meta have the best Code Arena | WebDev AI at the end of September 2026?",
      "description": "This market will resolve according to the company that owns the model that has the highest rank based on the arena.ai Code Arena | WebDev Leaderboard when the table under \"Code Arena | WebDev\" filtered for \"Models\" is checked on September 30, 2026, 12:00 PM ET.\n\nResults from the \"Rank\" column under the \"Code Arena | WebDev\" Leaderboard tab at https://arena.ai/leaderboard/code/webdev (Overall) filtered for \"Models\" will be used to resolve this market.\n\nModels will be ordered primarily by their leaderboard rank at the market’s check time. If two or more models are tied on rank, they will be orde",
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      "close_at": "2026-09-30T23:59:00Z",
      "resolve_at": "2026-09-30T23:59:00Z",
      "status": "open",
      "resolution": {
        "rules_raw": "This market will resolve according to the company that owns the model that has the highest rank based on the arena.ai Code Arena | WebDev Leaderboard when the table under \"Code Arena | WebDev\" filtered for \"Models\" is checked on September 30, 2026, 12:00 PM ET.\n\nResults from the \"Rank\" column under the \"Code Arena | WebDev\" Leaderboard tab at https://arena.ai/leaderboard/code/webdev (Overall) filtered for \"Models\" will be used to resolve this market.\n\nModels will be ordered primarily by their leaderboard rank at the market’s check time. 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 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 first place under this ranking.\n\nThe 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\".",
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