{
  "period": "rolling-30d-2026-10-20",
  "generated_at": "2026-10-20T06:21:22.470Z",
  "window_days": 30,
  "total_checks": 1000,
  "total_cited": 177,
  "total_brand_checks": 421,
  "total_brand_cited": 177,
  "total_non_brand_checks": 579,
  "total_non_brand_cited": 0,
  "non_brand_cite_rate": 0,
  "by_engine": [
    {
      "engine": "ChatGPT",
      "total_checks": 764,
      "cited": 118,
      "cite_rate": 0.1545,
      "brand_checks": 307,
      "brand_cited": 118,
      "brand_cite_rate": 0.3844,
      "category_checks": 271,
      "category_cited": 0,
      "category_cite_rate": 0,
      "discovery_checks": 186,
      "discovery_cited": 0,
      "discovery_cite_rate": 0,
      "non_brand_checks": 457,
      "non_brand_cited": 0,
      "non_brand_cite_rate": 0
    },
    {
      "engine": "Claude",
      "total_checks": 236,
      "cited": 59,
      "cite_rate": 0.25,
      "brand_checks": 114,
      "brand_cited": 59,
      "brand_cite_rate": 0.5175,
      "category_checks": 65,
      "category_cited": 0,
      "category_cite_rate": 0,
      "discovery_checks": 57,
      "discovery_cited": 0,
      "discovery_cite_rate": 0,
      "non_brand_checks": 122,
      "non_brand_cited": 0,
      "non_brand_cite_rate": 0
    }
  ],
  "methodology": "PressGEO Research logs every probe in the public citation monitor. Each row records (engine, query, whether a PressGEO-published URL appeared in the engine's answer, citation position, surrounding excerpt). Coverage spans ChatGPT, Gemini, Perplexity, Microsoft Copilot, Claude, Grok, and Reddit. This dataset aggregates the rolling 30-day window ending 2026-10-20 (UTC). cite_rate = cited / total_checks. Every probe is classified by tier: brand_aware (prompt names the brand), category_intent (prompt names the category but not the brand), or discovery (generic problem-statement prompt). Non-brand cite_rate = (category_cited + discovery_cited) / (category_checks + discovery_checks) and is the meaningful GEO accountability metric.",
  "license": "CC-BY-4.0",
  "citation": "PressGEO Research (2026). AI Citation Rates by Engine, October 2026. https://pressgeo.com/api/public/research/citation-rates-latest.json",
  "homepage": "https://pressgeo.com/research/data"
}