PerplexityBot
In one line
PerplexityBot is the web crawler Perplexity uses to gather sources for its answer engine — controllable separately via robots.txt.
Going deeper
PerplexityBot is the crawler Perplexity uses to gather citation sources. If you want your domain to show up inside Perplexity's answers, this bot needs access.
Control it with a 'User-agent: PerplexityBot' rule in robots.txt. Most brand sites allow it; blocking it effectively removes you from Perplexity citations.
Heads up: there are related user agents like Perplexity-User, and they are easy to confuse. Double-check the exact bot name before pushing a change.
Sources
Related terms
Perplexity
Perplexity is an answer engine that turns search results into a single cited answer, attaching a numbered source to every sentence — making it a common reference surface for measuring GEO performance.
GEO·AEOGPTBot
GPTBot is OpenAI's official web crawler used for ChatGPT training and search indexing — controllable via robots.txt.
GEO·AEOClaudeBot
ClaudeBot is Anthropic's web crawler used for training Claude and grounding its answers — manageable via robots.txt.
GEO·AEOGoogle-Extended
Google-Extended is the separate user agent Google uses for training Gemini and Vertex AI, letting site owners control AI training access independently from regular search indexing.
GEO·AEOllms.txt
llms.txt is a proposed text file placed at the site root that tells large language models where the most important content lives — think 'sitemap, but written for LLMs'.
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