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Claude の引用調査:測定した 20011 件の回答で Claude が引用しているもの

13 か月にわたる Claude の回答 20011 件のデータ調査:最も多く引用しているプラットフォーム、引用密度、そしてほかの 4 つの AI との違いを分析しました。

公開日:
4/9/2026
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更新日:
4/9/2026
Sorank が Claude の回答 20011 件で測定した、Claude が最も多く引用しているプラットフォームの棒グラフ
Sorank が Claude の回答 20011 件で測定した、Claude が最も多く引用しているプラットフォームの棒グラフ
Sorank創業者 Thibault Besson-Magdelain

著者について

Thibault Besson-Magdelain

Sorank創業者。SEO歴7年以上、GEOに情熱を注いでいます。
目次

The short answer

Claude was measured on 20011 answers over 13 months. Its most cited platform is Trustpilot at 1.57%, and it names on average 3.5 sources per answer, which places it fourth of the five models measured.

Claude cites the smallest and most selective set of sources of the five models, and it ignores several platforms the others rely on.

Key figures

  • 301025 AI answers analysed between August 2025 and August 2026
  • 1820738 citations extracted from those answers
  • 131349 distinct domains cited at least once
  • 5 models measured separately: ChatGPT, Gemini, Perplexity, Claude and Grok
  • 79% of the questions asked in French, the rest in English

What Claude cites most

  • Trustpilot: 1.57%
  • HubSpot: 0.5%
  • Amazon: 0.49%
  • Indeed: 0.28%
  • LinkedIn: 0.25%
  • Yelp: 0.22%
  • TripAdvisor: 0.19%
  • Salesforce: 0.17%
  • Microsoft: 0.14%
  • Facebook: 0.11%
  • Notion: 0.08%
  • Slack: 0.08%

How many sources each model names

  • Gemini: 11.1 sources per answer
  • Grok: 7.1 sources per answer
  • ChatGPT: 4.1 sources per answer
  • Claude: 3.5 sources per answer
  • Perplexity: 3.3 sources per answer

How to read these numbers

A citation rate of 2% means the source was cited twice for every 100 measured answers. Rates are computed per model against the number of answers of that model, so a model with a smaller sample never distorts a column. A source cited several times inside one answer is counted once per company block, which keeps a single verbose answer from dominating a month.

The distribution is worth as much as the ranking. The top three sources hold 63% of the citations counted in this table, 1 platform sits above 1%, and Trustpilot is cited 3.1 times more often than HubSpot. A market where three sources hold most of the citations rewards depth on those three rather than presence everywhere.

What changed over 13 months

Citation density on Claude moved from 4.7 to 2.1 sources per answer over the period. The platforms it cites moved too: Trustpilot is now first at 1.57%.

Citation density month by month

  • August 2025: 4.7 sources per answer
  • September 2025: 4.9 sources per answer
  • October 2025: 5.6 sources per answer
  • November 2025: 3.3 sources per answer
  • December 2025: 3.2 sources per answer
  • January 2026: 3.5 sources per answer
  • February 2026: 4 sources per answer
  • March 2026: 4 sources per answer
  • April 2026: 2.9 sources per answer
  • May 2026: 3 sources per answer
  • June 2026: 1.7 sources per answer
  • July 2026: 2.2 sources per answer
  • August 2026: 2.1 sources per answer

What this means in practice

Claude behaves like a careful analyst: fewer sources, more weight on specialised and professional references, and near indifference to community platforms. For a business, that means generic social proof does not travel here. What travels is domain specific documentation, professional directories in your field, and content that reads as expert rather than promotional. It is the hardest model to enter and the least noisy once you are in.

How to use this study

  1. Publish the documentation and technical detail that a specialist would check, not the marketing summary.
  2. Get listed in the professional directories of your sector, which carry more weight here than social platforms.
  3. Do not expect forum activity to move this model: several community platforms register no citations at all.

How this study was measured

  1. We run a panel of buyer questions every month, the questions people type before choosing a supplier.
  2. Every question is sent to five AI: ChatGPT, Gemini, Perplexity, Claude and Grok.
  3. Every answer is parsed, every cited source is extracted and normalised to a domain and a platform.
  4. The citation rate is the number of citations of a source per 100 measured answers, computed per model so an uneven number of answers per model never distorts a column.
  5. The month is closed, the dataset is rebuilt, and the public files are republished on data.sorank.com.

Limits of this study

  1. This panel is not a neutral sample of the web. The questions come from the sectors our users operate in.
  2. The panel leans French: 237930 answers come from questions asked in French and 63095 from questions asked in English.
  3. Model coverage is uneven: 87008 answers from ChatGPT, 87004 from Perplexity, 87000 from Gemini, 20011 from Claude and 20002 from Grok. The two smallest samples are read as direction rather than as precise values.
  4. A citation is not a click. This study measures what the AIs cite, not what a reader does next.

The dataset behind this study

Every number on this page comes from the public Sorank dataset. The underlying figures, the monthly detail and the filters are available here:

Open the source data on data.sorank.com

Data updated on 2026-08-26.

How to cite this study

This study is free to quote, in an article, a deck or a report. Please cite the source and the measurement period, because the numbers move every month.

Sorank (2026). Claude Citation Study: What Claude Cites in 20011 Measured Answers. Sorank GEO studies, measured on 301025 AI answers collected between August 2025 and August 2026. Available at https://www.sorank.com/data/claude-citation-study

The same panel, read from another angle:

Measure your own citations

This study describes a market. Sorank measures your site: which questions mention you, which mention someone else, and what to publish to change that, tracked weekly across the same five AI.

Start with 3 days free. A payment card is required to open the trial.

よくある質問

Claude が最も多く引用しているプラットフォームはどれですか?

Trustpilot(1.57%)がトップで、HubSpot(0.5%)、Amazon(0.49%)が続きます。完全なランキングはこのページにあり、元データは data.sorank.com で公開しています。

この調査はどのように測定したのですか?

2025 年 8 月から 2026 年 8 月までに 5 つの AI から集めた 301025 件の回答をもとに、引用されたすべての情報源を抽出して正規化しました。引用率は、測定した回答 100 件あたりの引用数です。公開データセットは data.sorank.com にあります。

プラットフォーム別の調査で、Claude が登場しないものがあるのはなぜですか?

その期間、Claude におけるそのプラットフォームの引用率の測定値がゼロだからです。データの欠落ではなく実際の結果です。集めた回答の中で、モデルがそのプラットフォームを単に引用しなかったのです。

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