Prompts that name a brand are much more likely to show an ad

Audience targeting

Outcome	Names a Brand (%)	Names No Brand (%)
An Ad Appeared	61%	39%
No Ad Appeared	36%	64%

ChatGPT Ads: Share of prompts naming a brand, split by whether a competitor ad appeared (%)

Reader Note:: The linked table splits ChatGPT prompts by whether they named a brand and whether an ad appeared. In the figure, among prompts where an ad appeared, 61% named a brand and 39% named no brand; among prompts with no ad, 36% named a brand and 64% named no brand. This is an observed association from Similarweb's panel, not a causal test of targeting rules, and the source calls the related pre-ad exchange analysis early and directional.
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.

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 never says how this number was measured.
The source says how much it looked at, but not how any of it was chosen.

ChatGPT accounts in lower-income US ZIP codes were more likely to be shown ads

55%

of Dreamdata customers use LinkedIn Matched Audiences to run ads in 2025

of observed ChatGPT ads had no meaningful connection to the response in Seer’s updated July 2026 scoring

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

58%

of observed ChatGPT ads were only category-adjacent to the response in Seer’s updated July 2026 scoring

24%

of prompts showed an ad for the median exposed ChatGPT account after its first ad during March 8–31, 2026

7.3%

of a brand’s own prompt responses showed that brand’s ad after about two weeks of Seer’s July 2026 tracking