{
 "study": "s22",
 "version": "1.1",
 "collected": "2026-09-26",
 "statistics": {
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    "fetched": 270,
    "fetch_rate_pct": 67.5,
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     157.0
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    "over_2y_pct": 9.0,
    "dated_pages": 166
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   "AI Mode": {
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    "fetched": 284,
    "fetch_rate_pct": 71.0,
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    "median_age_ci95": [
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     158
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   "ChatGPT": {
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    "fetched": 282,
    "fetch_rate_pct": 75.2,
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     65.0
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    "within_12m_pct": 89.5,
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    "dated_pages": 162
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   "Gemini": {
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    "fetched": 142,
    "fetch_rate_pct": 75.5,
    "with_date_pct": 81.0,
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    "median_age_ci95": [
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     102
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    "within_12m_pct": 84.3,
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    "dated_pages": 115
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    "fetched": 281,
    "fetch_rate_pct": 70.2,
    "with_date_pct": 77.9,
    "median_age_days": 60,
    "median_age_ci95": [
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     94
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    "over_2y_pct": 7.8,
    "dated_pages": 219
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   "Claude": {
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    "fetched": 194,
    "fetch_rate_pct": 77.0,
    "with_date_pct": 76.8,
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    "median_age_ci95": [
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     74
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    "within_12m_pct": 92.6,
    "over_2y_pct": 4.0,
    "dated_pages": 149
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   "Google organic top 10 (baseline)": {
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    "fetched": 3096,
    "fetch_rate_pct": 100.0,
    "with_date_pct": 47.8,
    "median_age_days": 111.0,
    "median_age_ci95": [
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     122.5
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    "within_12m_pct": 73.4,
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    "dated_pages": 1480
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  "derived": {
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    32.5
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 "v1_1": {
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  "collected": "2026-09-26",
  "same_question_pages_fetched": "2026-09-28",
  "seed": 20260928,
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    "median": 113.0,
    "within_90d_pct": 44.6,
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    "over_2y_pct": 9.0,
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    "fetched": 270,
    "median_ci95_query_clusters": [
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     157.0
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     52.8
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    "queries": 129,
    "unmatched_pages": 0
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   "AI Mode": {
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    "median": 111,
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     158.0
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     53.5
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    "queries": 113,
    "unmatched_pages": 0
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   "ChatGPT": {
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    "median": 50.5,
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     69.5
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    "unmatched_pages": 0
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   "Claude": {
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     69.8
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   "Perplexity": {
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     99.0
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    "unmatched_pages": 0
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   "Gemini": {
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    "median": 65,
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    "fetched": 142,
    "median_ci95_query_clusters": [
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     102.0
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    "queries": 57,
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    "median": 111.0,
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     127.0
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    "within_90d_ci95_query_clusters": [
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     49.3
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   "google_same_question": {
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    "median": 92,
    "within_90d_pct": 49.8,
    "within_12m_pct": 77.5,
    "over_2y_pct": 13.1,
    "pages": 547,
    "fetched": 391,
    "median_ci95": [
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     121.0
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   "ChatGPT": {
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    "median": 50.5,
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    "questions": 80,
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     0.8
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    "within_90d_diff_ci95": [
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     23.5
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   },
   "Claude": {
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    "median": 54,
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    "query_page_pairs": 253,
    "questions": 61,
    "age_ratio_within_question": 0.759,
    "age_ratio_ci95": [
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    "within_90d_diff_ci95": [
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   },
   "Perplexity": {
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    "median": 60,
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    "questions": 80,
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    "within_90d_diff_ci95": [
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     18.7
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   },
   "Gemini": {
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    "median": 65,
    "within_90d_pct": 57.4,
    "within_12m_pct": 84.3,
    "over_2y_pct": 5.2,
    "query_page_pairs": 188,
    "questions": 59,
    "age_ratio_within_question": 0.7759999999999999,
    "age_ratio_ci95": [
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    "within_90d_diff_pts": 6.8,
    "within_90d_diff_ci95": [
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   "All four assistants": {
    "dated": 645,
    "median": 57,
    "within_90d_pct": 59.7,
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    "over_2y_pct": 5.9,
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    "questions": 80,
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    "within_90d_diff_ci95": [
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     17.2
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  "selection": {
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    "searches": 485,
    "cited_pct": 30.2,
    "reference": "no machine-readable date",
    "coef_pts": {
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     "dated 91-365 days": 8.3,
     "dated over 1 year": 12.1
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    "ci95": {
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      10.3
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     "dated 91-365 days": [
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      13.6
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     "dated over 1 year": [
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   },
   "aio_within_search_dated_only": {
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    "searches": 429,
    "fresh90_vs_older_pts": -4.1,
    "ci95": [
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     1.3
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   },
   "aio_by_temporal_class": {
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     "searches": 330,
     "fresh90_vs_older_pts": -5.3,
     "ci95": [
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      0.9
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     "fresh90_share_pct": 46.4
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    "time-sensitive": {
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     "searches": 86,
     "fresh90_vs_older_pts": 2.0,
     "ci95": [
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      13.0
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     "fresh90_share_pct": 45.0
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   },
   "aio_by_intent": {
    "commercial": {
     "pages": 833,
     "searches": 216,
     "fresh90_vs_older_pts": -9.3,
     "ci95": [
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      -2.4
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     "fresh90_share_pct": 49.9
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    "informational": {
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     "searches": 128,
     "fresh90_vs_older_pts": 6.3,
     "ci95": [
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      16.0
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     "fresh90_share_pct": 39.8
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    "transactional": {
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     "searches": 66,
     "fresh90_vs_older_pts": 8.6,
     "ci95": [
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      32.3
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     "fresh90_share_pct": 44.5
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   },
   "assistants_within_google_top10": {
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    "engine_question_pairs": 320,
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    "fresh90_vs_older_pts": 6.2,
    "ci95": [
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     11.6
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    "fresh90_share_pct": 49.8
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  },
  "composition": {
   "google_mix_pct": {
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    "no article markup / other website": 38.4,
    "article markup / reference (gov, edu, Wikipedia)": 3.9,
    "no article markup / reference (gov, edu, Wikipedia)": 1.5,
    "no article markup / review site or directory": 0.9,
    "article markup / review site or directory": 0.3,
    "no article markup / retailer or marketplace": 0.2,
    "article markup / retailer or marketplace": 0.2
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   "google_article_markup_pct": 59.0,
   "google_within_90d_by_kind_pct": {
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    "no article markup / other website": 40.6,
    "no article markup / reference (gov, edu, Wikipedia)": 40.9,
    "article markup / review site or directory": 0.0,
    "article markup / reference (gov, edu, Wikipedia)": 75.9,
    "no article markup / review site or directory": 30.8,
    "no article markup / retailer or marketplace": 33.3,
    "article markup / retailer or marketplace": 66.7
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   "google_median_same_pages": 111.0,
   "AI Overviews": {
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    "raw_median": 113.0,
    "raw_within_90d_pct": 44.6,
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    "std_median_ci95": [
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     170.0
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    "std_within_90d_pct": 42.9,
    "std_within_90d_ci95": [
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    "google_mix_covered_pct": 98.4,
    "within_90d_article_pct": 49.6,
    "within_90d_no_article_pct": 32.7
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   "AI Mode": {
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    "raw_within_90d_pct": 45.5,
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    "std_median_ci95": [
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     158.0
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    "std_within_90d_pct": 46.1,
    "std_within_90d_ci95": [
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     53.8
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    "google_mix_covered_pct": 98.7,
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    "within_90d_no_article_pct": 54.9
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   "ChatGPT": {
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    "raw_within_90d_pct": 65.4,
    "std_median": 43.0,
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    "std_within_90d_pct": 66.5,
    "std_within_90d_ci95": [
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     73.2
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    "google_mix_covered_pct": 95.7,
    "within_90d_article_pct": 66.0,
    "within_90d_no_article_pct": 64.4
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   "Claude": {
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    "raw_within_90d_pct": 61.1,
    "std_median": 54.0,
    "std_median_ci95": [
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    "std_within_90d_ci95": [
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    "within_90d_no_article_pct": 56.8
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   "Perplexity": {
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     99.0
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    "std_within_90d_ci95": [
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   "Gemini": {
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    "std_median": 65.0,
    "std_median_ci95": [
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     144.0
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    "std_within_90d_pct": 56.4,
    "std_within_90d_ci95": [
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     72.1
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    "google_mix_covered_pct": 93.0,
    "within_90d_article_pct": 57.7,
    "within_90d_no_article_pct": 54.5
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  "date_anatomy": {
   "AI Overviews": {
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    "classes_pct": {
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     "recent date, no publish date declared": 1.8,
     "dated the day of collection": 4.8,
     "not updated in 90 days": 55.4
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    "with_publish_date_pct": 92.2,
    "with_modified_date_pct": 92.8,
    "median_publish_age": 575,
    "recent_pages": 74,
    "recent_that_are_old_pages_pct": 66.2,
    "recent_that_are_collection_day_pct": 10.8
   },
   "AI Mode": {
    "dated": 167,
    "classes_pct": {
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     "older page with a recent modified date": 31.1,
     "recent date, no publish date declared": 3.6,
     "dated the day of collection": 3.0,
     "not updated in 90 days": 54.5
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    "with_publish_date_pct": 88.6,
    "with_modified_date_pct": 87.4,
    "median_publish_age": 736.5,
    "recent_pages": 76,
    "recent_that_are_old_pages_pct": 68.4,
    "recent_that_are_collection_day_pct": 6.6
   },
   "ChatGPT": {
    "dated": 162,
    "classes_pct": {
     "new page (published within 90 days)": 18.5,
     "older page with a recent modified date": 30.9,
     "recent date, no publish date declared": 9.9,
     "dated the day of collection": 6.2,
     "not updated in 90 days": 34.6
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    "with_publish_date_pct": 85.2,
    "with_modified_date_pct": 88.9,
    "median_publish_age": 294.0,
    "recent_pages": 106,
    "recent_that_are_old_pages_pct": 47.2,
    "recent_that_are_collection_day_pct": 9.4
   },
   "Claude": {
    "dated": 149,
    "classes_pct": {
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     "older page with a recent modified date": 36.2,
     "recent date, no publish date declared": 5.4,
     "dated the day of collection": 4.0,
     "not updated in 90 days": 38.9
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    "with_publish_date_pct": 90.6,
    "with_modified_date_pct": 94.0,
    "median_publish_age": 311,
    "recent_pages": 91,
    "recent_that_are_old_pages_pct": 59.3,
    "recent_that_are_collection_day_pct": 6.6
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   "Perplexity": {
    "dated": 219,
    "classes_pct": {
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     "older page with a recent modified date": 30.6,
     "recent date, no publish date declared": 4.1,
     "dated the day of collection": 3.7,
     "not updated in 90 days": 44.3
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    "with_publish_date_pct": 93.6,
    "with_modified_date_pct": 92.7,
    "median_publish_age": 537,
    "recent_pages": 122,
    "recent_that_are_old_pages_pct": 54.9,
    "recent_that_are_collection_day_pct": 6.6
   },
   "Gemini": {
    "dated": 115,
    "classes_pct": {
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     "older page with a recent modified date": 32.2,
     "recent date, no publish date declared": 1.7,
     "dated the day of collection": 1.7,
     "not updated in 90 days": 42.6
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    "with_publish_date_pct": 98.3,
    "with_modified_date_pct": 91.3,
    "median_publish_age": 284,
    "recent_pages": 66,
    "recent_that_are_old_pages_pct": 56.1,
    "recent_that_are_collection_day_pct": 3.0
   },
   "Google organic top 10 (baseline)": {
    "dated": 1480,
    "classes_pct": {
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     "older page with a recent modified date": 30.7,
     "recent date, no publish date declared": 4.8,
     "dated the day of collection": 5.1,
     "not updated in 90 days": 53.8
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    "with_publish_date_pct": 89.1,
    "with_modified_date_pct": 88.2,
    "median_publish_age": 801.0,
    "recent_pages": 684,
    "recent_that_are_old_pages_pct": 66.4,
    "recent_that_are_collection_day_pct": 11.0
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   "Google top 10, same question": {
    "dated": 267,
    "classes_pct": {
     "new page (published within 90 days)": 9.0,
     "older page with a recent modified date": 36.7,
     "recent date, no publish date declared": 3.0,
     "dated the day of collection": 1.1,
     "not updated in 90 days": 50.2
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    "with_publish_date_pct": 95.1,
    "with_modified_date_pct": 93.6,
    "median_publish_age": 733.0,
    "recent_pages": 133,
    "recent_that_are_old_pages_pct": 73.7,
    "recent_that_are_collection_day_pct": 2.3
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  },
  "query_temporality": {
   "classes": {
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     "assistant_questions": 9,
     "google_keywords": 105
    },
    "recommendation": {
     "assistant_questions": 71,
     "google_keywords": 16
    },
    "other": {
     "assistant_questions": 0,
     "google_keywords": 679
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   },
   "by_engine": {
    "AI Overviews": {
     "time-sensitive": {
      "dated": 54,
      "median": 163.5,
      "within_90d_pct": 33.3,
      "within_12m_pct": 70.4,
      "over_2y_pct": 5.6
     },
     "recommendation": {
      "dated": 8,
      "median": 60.0,
      "within_90d_pct": 75.0,
      "within_12m_pct": 100.0,
      "over_2y_pct": 0.0
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     "other": {
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    "Google organic top 10 (baseline)": {
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    "new_page_ci95": [
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     16.1
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   },
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    "new_page_ci95": [
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     12.6
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   },
   "ChatGPT": {
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    "new_page_ci95": [
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     30.3
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   },
   "Claude": {
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    "new_page_ci95": [
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   },
   "Perplexity": {
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    "new_page_ci95": [
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   },
   "Gemini": {
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    "new_page_ci95": [
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     31.5
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   },
   "Google organic top 10 (baseline)": {
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    "new_page_ci95": [
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     8.3
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   },
   "within_question": {
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     "new_page_diff_ci95": [
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     "publish_age_ratio_ci95": [
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     "publish_age_ratio_ci95": [
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   },
   "Google top 10, same question": {
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    "new_page_ci95": [
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     12.5
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 }
}