{
  "version": 1,
  "asOf": "2026-10-06",
  "latest": {
    "date": "2026-10-06",
    "url": "/data/snapshots/2026-10-06.json",
    "sha256": "c5d7bd17cb661028031845e3ff278809b60f952ac6949f20165d76a6d9dba285"
  },
  "what": "One file per UTC day: every catalogue row projected down to its LMArena scores, six workload prices, frontier flag and significance rank. Not the full catalogue. A null score means unmeasured; it is never zero.",
  "immutability": "A published body is byte-identical to the file tracked in the repository at data/snapshots/<date>.json and hashes to the sha256 shown here. Dates that fail the publication fence are withheld whole and listed below with the rule that fired; they are never redacted row-by-row, because a redacted body would depend on the current catalogue and its hash would move.",
  "licence": {
    "compilation": {
      "id": "CC-BY-4.0",
      "url": "https://creativecommons.org/licenses/by/4.0/",
      "attribution": "Undominated.ai, https://undominated.ai"
    },
    "prices": "Vendor list prices, collected from the public OpenRouter models API.",
    "arena": {
      "id": "cc-by-4.0",
      "url": "https://creativecommons.org/licenses/by/4.0/",
      "source": "https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset",
      "attribution": "LMArena leaderboard data © LMArena (lmarena-ai), from the official \"leaderboard-dataset\" at https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset, licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Changes made: for each model the highest-scoring Bradley-Terry Elo row from the `text` arena is selected, the reasoning effort that produced it is kept alongside the score, and the row is joined to a pricing record. Scores are otherwise unaltered."
    },
    "artificialAnalysis": "No Artificial Analysis figure is present, on any row, under any name. We hold no redistribution licence for them."
  },
  "published": [
    {
      "date": "2026-09-15",
      "url": "/data/snapshots/2026-09-15.json",
      "sha256": "b3e6b6681564caa8aa9f6da8d479d538e1cb2a2a80879c28997c4296b2b6526d",
      "bytes": 109854,
      "models": 428,
      "frontier": 11,
      "rated": 137,
      "fetchedAt": "2026-09-15"
    },
    {
      "date": "2026-09-22",
      "url": "/data/snapshots/2026-09-22.json",
      "sha256": "f5dfc6a35b907fb687a85b2ff72e6957ea63dd1307ced229637f2a7df654df5b",
      "bytes": 109021,
      "models": 425,
      "frontier": 12,
      "rated": 136,
      "fetchedAt": "2026-09-22"
    },
    {
      "date": "2026-09-30",
      "url": "/data/snapshots/2026-09-30.json",
      "sha256": "6085381e5a8b1a4741224ace2663384ae9c40c348959c3998cce3202a7f11013",
      "bytes": 113922,
      "models": 444,
      "frontier": 12,
      "rated": 135,
      "fetchedAt": "2026-09-30"
    },
    {
      "date": "2026-10-06",
      "url": "/data/snapshots/2026-10-06.json",
      "sha256": "c5d7bd17cb661028031845e3ff278809b60f952ac6949f20165d76a6d9dba285",
      "bytes": 114643,
      "models": 447,
      "frontier": 12,
      "rated": 145,
      "fetchedAt": "2026-10-06"
    }
  ],
  "withheld": [
    {
      "date": "2026-08-24",
      "reason": "denied-provider",
      "detail": "The body names one of the two upstream registry entries that never reach a published surface: a test fixture, and an entry serving a zero-priced model with no privacy policy. Neither is a seller anyone can buy from."
    },
    {
      "date": "2026-08-25",
      "reason": "denied-provider",
      "detail": "The body names one of the two upstream registry entries that never reach a published surface: a test fixture, and an entry serving a zero-priced model with no privacy policy. Neither is a seller anyone can buy from."
    },
    {
      "date": "2026-08-26",
      "reason": "arena-licence-unattested",
      "detail": "103 row(s) carry an LMArena figure that the CC BY 4.0 dataset we hold does not carry for that model on that board. Redistributing a score whose channel we cannot show is the same class of claim as publishing a price we cannot trace."
    },
    {
      "date": "2026-08-28",
      "reason": "arena-licence-unattested",
      "detail": "117 row(s) carry an LMArena figure that the CC BY 4.0 dataset we hold does not carry for that model on that board. Redistributing a score whose channel we cannot show is the same class of claim as publishing a price we cannot trace."
    },
    {
      "date": "2026-08-29",
      "reason": "arena-licence-unattested",
      "detail": "117 row(s) carry an LMArena figure that the CC BY 4.0 dataset we hold does not carry for that model on that board. Redistributing a score whose channel we cannot show is the same class of claim as publishing a price we cannot trace."
    },
    {
      "date": "2026-08-30",
      "reason": "arena-licence-unattested",
      "detail": "118 row(s) carry an LMArena figure that the CC BY 4.0 dataset we hold does not carry for that model on that board. Redistributing a score whose channel we cannot show is the same class of claim as publishing a price we cannot trace."
    },
    {
      "date": "2026-09-02",
      "reason": "arena-licence-unattested",
      "detail": "117 row(s) carry an LMArena figure that the CC BY 4.0 dataset we hold does not carry for that model on that board. Redistributing a score whose channel we cannot show is the same class of claim as publishing a price we cannot trace."
    },
    {
      "date": "2026-09-03",
      "reason": "arena-licence-unattested",
      "detail": "117 row(s) carry an LMArena figure that the CC BY 4.0 dataset we hold does not carry for that model on that board. Redistributing a score whose channel we cannot show is the same class of claim as publishing a price we cannot trace."
    },
    {
      "date": "2026-09-04",
      "reason": "arena-licence-unattested",
      "detail": "116 row(s) carry an LMArena figure that the CC BY 4.0 dataset we hold does not carry for that model on that board. Redistributing a score whose channel we cannot show is the same class of claim as publishing a price we cannot trace."
    },
    {
      "date": "2026-09-08",
      "reason": "arena-licence-unattested",
      "detail": "115 row(s) carry an LMArena figure that the CC BY 4.0 dataset we hold does not carry for that model on that board. Redistributing a score whose channel we cannot show is the same class of claim as publishing a price we cannot trace."
    },
    {
      "date": "2026-09-11",
      "reason": "arena-licence-unattested",
      "detail": "119 row(s) carry an LMArena figure that the CC BY 4.0 dataset we hold does not carry for that model on that board. Redistributing a score whose channel we cannot show is the same class of claim as publishing a price we cannot trace."
    },
    {
      "date": "2026-09-23",
      "reason": "denied-provider",
      "detail": "The body names one of the two upstream registry entries that never reach a published surface: a test fixture, and an entry serving a zero-priced model with no privacy policy. Neither is a seller anyone can buy from."
    },
    {
      "date": "2026-09-29",
      "reason": "denied-provider",
      "detail": "The body names one of the two upstream registry entries that never reach a published surface: a test fixture, and an entry serving a zero-priced model with no privacy policy. Neither is a seller anyone can buy from."
    }
  ]
}