Also known as: Claude, Anthropic Claude, Claude AI
Claude is the family of large language models built by Anthropic, an AI company founded in 2021 by former OpenAI researchers. The Claude models — currently Opus 4.x, Sonnet 4.x and Haiku 4.x — are known for structured answers, long context windows of up to a million tokens, and strong performance on code and analysis tasks. Claude matters for GEO in two ways: as a chat engine in its own right with its own citation logic at claude.ai, and as the engine behind many third-party applications that embed Claude's answers in their own tools.
Claude generates answers with web access, both in claude.ai and through the Anthropic API, but cites its sources more compactly than Perplexity or ChatGPT Search — usually as numbered footnote references or in a sources footer. What Claude cites by preference: content that is factually substantiated and clearly structured; sources with a visible author and publication date; domains with solid brand authority; and pages carrying clear Schema.org markup. Anthropic places explicit weight on reliable sources, so domains with weak experience, expertise, authority and trust signals are cited less often.
Anthropic operates several crawlers: ClaudeBot for training, Claude-User for on-demand requests during a user session, and Claude-SearchBot for live search. Allowing all three in robots.txt makes a site citable in Claude's answers. Blocking only ClaudeBot opts a site out of training while keeping it visible for live user requests — a pragmatic middle setting for sites that reject training use but want to keep their GEO visibility.
Through the Anthropic API, Claude models power a great many third-party applications — from the coding assistant Cursor to the search engine Perplexity, whose Pro Search can run on Claude, to corporate chatbots. That makes visibility in Claude worth more than the direct claude.ai user base suggests: whatever Claude cites as a source can surface in hundreds of independent tools.
Example: A specialist blog on data visualisation publishes 24 detailed tutorials with code samples, a clear question-and-answer structure in its headings, and Article schema. After eight weeks of citation tracking the picture is clear: for 14 of the 24 topics the domain appears among the top three sources in Claude's answers — a higher citation rate than it achieves in ChatGPT for the same topics. The explanation is that Claude's answer logic favours structured, evidence-backed tutorials over generic magazine articles.
Claude citation tracking in Rankmio
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