B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
600
600 -- advertiser count for ChatGPT advertising (2026-03)
As of late March 2026, OpenAI was working with more than 600 advertisers in its ChatGPT ad pilot.
- The source specifies '600+' or 'more than 600' advertisers
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
600
Unit
Count
Data Vintage
2026-03
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
OpenAI
Primary
Tier B
https://thepromptinsider.com/news/chatgpt-just-opened-ads-to-everyone-heres-what-it-means-for-your-a… ↗
Source Article
ChatGPT Opened Ads to Everyone. Here’s What It Means for AEO
Quick Summary
- OpenAI launched ChatGPT advertising on February 9, 2026, and self-serve ad tools are rolling out in April 2026.
- The pilot crossed $100 million in annualized revenue within six weeks, with 600+ advertisers already running campaigns.
- Paid placements and organic AI citations now coe…
Original Research
OpenAI
· Original study ↗
Methodology
CNBC reporting on OpenAI announcement
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
ChatGPT advertising: 600 advertiser count. Source: OpenAI (2026-03). Via Lighthouse Intelligence -- https://lighthousedata.io/data/chatgpt-advertisers-pilot-600
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<blockquote cite="https://lighthousedata.io/data/chatgpt-advertisers-pilot-600" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>600</strong> -- advertiser count for ChatGPT advertising<br><small>Source: OpenAI (2026-03) · <a href="https://lighthousedata.io/data/chatgpt-advertisers-pilot-600" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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