Claude
Claude is the family of large language models built by Anthropic, used in the Claude.ai assistant, Claude API, and Claude-integrated tools. Claude is increasingly used as a research and analysis surface, with citation behavior comparable to ChatGPT.
What it is
Claude is Anthropic's flagship LLM family, with models including Claude Opus, Claude Sonnet, and Claude Haiku. Claude is accessible through Claude.ai, the Anthropic API, and integrations in many third-party tools (Cursor, Notion AI, etc.). Claude has its own web-retrieval and citation behaviors and is one of the four major AI engines that GEO must address. Claude's training and retrieval prefer well-structured, machine-readable sources — making llms.txt, schema markup, and answer-ready content particularly impactful for Claude citation.
Why it matters for GEO
Claude's user base skews to developers, writers, and operators using it as a daily reasoning tool. Citation in Claude's outputs is high-quality mindshare.
The CiterLabs perspective
Claude is one of the four engines CiterLabs tracks and optimizes for. Anthropic's ClaudeBot is on the allow-list in every CiterLabs robots.txt template.
- ChatGPT Search — ChatGPT Search is the search-augmented mode of ChatGPT, launched in late 2024, that retrieves and cites web sources alongside generated answers.
- Perplexity AI — Perplexity AI is an AI answer engine that combines large language models with real-time web search and inline citations.
- Generative Engine Optimization (GEO) — Generative Engine Optimization (GEO) is the practice of structuring a brand's content, entity footprint, and third-party signals so that AI engines like ChatGPT, Perplexity, Claude, and Google AI Overviews cite that brand inside their generated answers.
Want to be cited for terms like Claude?
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