Actors

human_via_ai

A person who arrived from ChatGPT, Perplexity, Claude, Gemini, Copilot, Grok, or DeepSeek.

This is the actor that makes Vector 5 different from "we added a GPTBot row to a Plausible clone." It is a human, attributed to an assistant.

Assistant referrers

Hostai_source
chatgpt.com, chat.openai.comchatgpt
perplexity.ai, www.perplexity.aiperplexity
claude.aiclaude
gemini.google.comgemini
copilot.microsoft.comcopilot
grok.comgrok
chat.deepseek.comdeepseek

UTM overrides

If an assistant strips the referrer, you can still mark the click: utm_medium=ai_search or utm_medium=ai-assistant, or utm_source of chatgpt, perplexity, claude, gemini (and prefixes of chatgpt).

The Direct problem

Many ChatGPT citations open without a referrer. Those visits look like Direct in every other tool. Vector 5 cannot invent a referrer that was not sent — but crawl→referral on the same path tells you which pages assistants cite versus which ones people click. See AI traffic and the Cited but not clicked skill.

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