The Cillex Index.
A quarterly read on CPC, CPM, click-through, and citation share across OpenAI Ads, Perplexity, Gemini, and Google AIO. Anonymized aggregate data from Cillex client accounts plus public reporting.
The first read.
Q2 2026 issue publishes July 2026. These are the directional numbers we are seeing from May data.
$4.20
Median CPC on OpenAI Ads, DTC ecom, May 2026.
$11.80
Median CPC on OpenAI Ads, B2B SaaS, May 2026.
7.4%
Median CTR on OpenAI Ads sponsored cards.
+38%
Citation share lift on AIO after schema implementation.
How the data is sourced.
- Cillex client accounts (anonymized): aggregated CPC, CPM, CTR, and conversion data across all Cillex-managed accounts, normalized by category and geo.
- Public reporting: OpenAI Ads platform announcements, partner agency reports, public earnings disclosures.
- Citation tracking: Cillex's LLM Visibility Score sampler — 1,400 representative queries probed weekly across the four engines.