# The measurement blind spot

35–70% of AI-referred sessions arrive with no referrer data and get miscounted as ‘Direct’ traffic. GA4 only added a native ‘AI Assistant’ channel in May 2026 — and it still misses several engines. Whatever AI traffic you’re reporting, it’s an undercount.

Canonical: https://robauto.ai/learn/ai-search-aeo/12

_AI Search (AEO/GEO): Get Found by Machines That Answer — lesson 12 of 20 (STAT)_

**35–70%**

35–70% of AI-referred sessions arrive with no referrer data and get miscounted as ‘Direct’ traffic. GA4 only added a native ‘AI Assistant’ channel in May 2026 — and it still misses several engines. Whatever AI traffic you’re reporting, it’s an undercount.

Source: [Adwen Plus practitioner data; GA4 changelog (2026)](https://support.google.com/analytics?utm_source=robauto)

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