Vendor reportGraphite and Similarweb, 2026

As of September 2026 it’s already 43% of ad-eligible US ChatGPT users who saw ads

Channel validation

43%

of ad-eligible ChatGPT users in the US saw ads as of September 2026

Reader Note:: This is a Similarweb panel estimate for the share of ad-eligible ChatGPT users in the US who were reached by ads. The slide is current as of September 2026 unless otherwise noted. The source does not disclose the panel size or the exact date window behind this reach figure.
Evidence:: Observed behaviour
Vendor interest:: Moderate — This comes from a company with a commercial interest in this market, so it is not a neutral source.
Sample:: Similarweb user panel across 9 live ChatGPT ad markets (panel size not disclosed), plus Graphite analysis of 95k+ US ChatGPT ads from 500+ advertisers, 70k+ creatives, 50k+ headlines, and 8k+ landing pages from April to mid-August 2026.

Good for

Comparing yourself against a similar segment, and choosing what to test next.

Not for

Saying that one thing caused another, or predicting what you would get.
This comes from a company with a commercial interest in this market, so it is not a neutral source.
The source says how much it looked at, but not how any of it was chosen.

4.4x

How much better an AI search visitor converts compared to an organic search visitor, on average

of Google searches that showed an AI summary ended with a click on a link inside that summary (US, March 2025)

20% of Gen Z and 17% of Millennials discover new brands through influencer endorsements, vs 12% of Gen X and 5% of Boomers

Share of each generation who discover new brands via influencer endorsements
Generation	Share who discover brands through influencers (%)
Gen Z	20%
Millennials	17%
Gen X	12%
Baby Boomers	5%

Go deeper on this topic

Our Substack turns the data behind these cards into full breakdowns: what changed, why, and what to do about it.

Fixing your influencer marketing campaign: How to get into the top 10% of advertisers

11.4%

of shopper sessions in the US involved an AI tool as of June 2026, up 2.3 percentage points from a year earlier

is the short-term ROI index for influencer campaigns in the UK, right on the market average with 4.5% of short-term sales (excluding campaigns that produced no result)

21–26%

of consumers in the US, UK, and Germany report using AI tools to research products online, per Statista's 2026 Global Survey (Jul 2025–Jun 2026).

As of September 2026 it’s already 43% of ad-eligible US ChatGPT users who saw ads

Good for

Not for

Related cards

Go deeper on this topic