# Epsilon: how AI models rank it, September 2026

GTM AI Recommendation Index, September 2026 Edition. Named in 6 judge labels across 2 categories by 5 of 12 models. Page: https://gtm-ai-index.com/vendors/epsilon/

## Standing by category

| Category | Share | Rank | Negative rate | Labels |
|---|---|---|---|---|
| Identity resolution | 0% | 59 | 20% | 5 |
| Programmatic and display advertising | 0% | 73 | 100% | 1 |

## And against it

- "Publicis disputes these findings... but the controversy alone warrants caution." (DeepSeek V4 Flash, Programmatic)
- "CORE ID (Epsilon)—these create brutal switching costs" (Kimi K2, Identity)

## Record

- Method: https://gtm-ai-index.com/methodology/
- Raw judge labels and full responses: https://gtm-ai-index.com/data/
- License: CC BY 4.0. Cite as GTM AI Recommendation Index, September 2026 Edition, gtm-ai-index.com.