{
  "benchmark": "ParseStream GovTwin lexical text proxies",
  "snapshot": "E1, June 2026",
  "sample_policy": "Full-PDF/full-HTML pairs where the authoritative HTML covers the PDF's complete content",
  "sample_size": 4,
  "limitations": [
    "One live run per document",
    "Word 4-gram recall is set overlap and ignores frequency",
    "Order tau uses only distinctive shared 6-gram anchors",
    "The metrics do not measure semantic HTML, structure, tables, headings, alt text, or accessibility"
  ],
  "rows": [
    {
      "id": "fr-2026-11363",
      "title": "Exceptions From Foreign Ownership, Control, or Domination",
      "source": "Federal Register",
      "ttfc_ms": 3532.1,
      "ttlb_ms": 9395.7,
      "word_4gram_recall": 0.897,
      "shared_6gram_order_tau_b": 1,
      "shared_6gram_anchors": 608
    },
    {
      "id": "fr-2026-11311",
      "title": "Special Local Regulation; Genesee River, Rochester, NY",
      "source": "Federal Register",
      "ttfc_ms": 3004.9,
      "ttlb_ms": 16027.9,
      "word_4gram_recall": 0.936,
      "shared_6gram_order_tau_b": 1,
      "shared_6gram_anchors": 1278
    },
    {
      "id": "fr-2026-11308",
      "title": "Medical Devices; Orthopedic Devices",
      "source": "Federal Register",
      "ttfc_ms": 3414.7,
      "ttlb_ms": 35640,
      "word_4gram_recall": 0.932,
      "shared_6gram_order_tau_b": 1,
      "shared_6gram_anchors": 2538
    },
    {
      "id": "govuk-benefit-and-pension-rates-2026-to-2027",
      "title": "Benefit and pension rates 2026 to 2027",
      "source": "GOV.UK",
      "ttfc_ms": 2488,
      "ttlb_ms": 79702.4,
      "word_4gram_recall": 0.754,
      "shared_6gram_order_tau_b": 0.998,
      "shared_6gram_anchors": 2149
    }
  ]
}