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Google Ads vs ChatGPT Ads Spend Share in September 2026
Alex Fusco
October 12, 2026
Last Updated:
Spend share by channel
Here is how spend broke down between the two channels in September.
Google Ads: 99.55%
ChatGPT Ads: 0.45%
That works out to roughly $221 in Google Ads spend for every $1 spent on ChatGPT Ads.
Methodology
This benchmark is based on aggregated, anonymized data from e-commerce brands using ThoughtMetric. It covers September 1 to September 30, 2026, and shows each channel's share of combined Google Ads and ChatGPT Ads spend. Figures are rounded to two decimal places.
Testing ChatGPT Ads
If you're testing ChatGPT Ads, be careful relying on last-click reporting. A shopper might discover your brand in ChatGPT, then come back later through a Google search or an email to buy. Last-click gives all the credit to that final visit, and ChatGPT Ads gets none.
Multi-touch attribution splits credit across every touchpoint that led to the purchase. That shows the role ChatGPT Ads plays across the full path to purchase.
We will continue to monitor spend share between Google Ads and ChatGPT Ads over the coming months. As the trend develops, we will publish updated numbers here.
Measure ChatGPT Ads alongside Google
ThoughtMetric tracks ChatGPT Ads alongside Google Ads and the rest of your campaigns, so you can see how each one contributes to revenue.
