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We ask it with web search on and record the pages it cites and the brands it names, on your own query set, refreshed on demand.
Claude's web search fetches pages with Anthropic's crawlers and cites what it loaded. A page that blocks them in robots.txt is out before any ranking happens.
Claude's citations point at the passage it used. A page with one clear sentence for the claim is easier to cite than one where the point is spread across a section.
Like the other engines, it weighs a brand that is described consistently across several sources over one that appears in a single place.
Not reliably. The two can draw on different pages for the same question, which is why Source records each engine separately instead of averaging them.