# Google Meridian: how AI models rank it, October 2026

GTM AI Recommendation Index, October 2026 Edition. Named in 34 judge labels across 1 categories by 13 of 14 models. Page: https://gtm-ai-index.com/vendors/google-meridian/

## Standing by category

| Category | Share | Rank | Negative rate | Labels |
|---|---|---|---|---|
| Attribution and marketing mix modeling | 5% | 4 | 12% | 34 |

## What the models said for it

- "open-source MMM tools like Meta's Robyn or Google's Meridian are increasingly attractive due to their transparency and cost-effectiveness" (Mistral Small, Attribution & MMM)
- "Open-source Bayesian MMM, native Google Ads integration... Successor to LightweightMMM; free, transparent code" (GLM 4.7 FlashX, Attribution & MMM)
- "Google's Meridian is a Bayesian MMM framework released openly for anyone to use—no licensing fees." (Grok 4.1 Fast, Attribution & MMM)
- "The best free MMM option if you have data science talent." (GLM 4.7 FlashX, Attribution & MMM)

## And against it

- "Free, open-source libraries like Google Meridian or Meta Robyn require dedicated data scientists... a SaaS platform with a managed service component is almost always the right choice" (Gemini 3.5 Flash, Attribution & MMM)
- "Mid-market companies rarely have full-time data scientists to manage open-source MMM code (like Google Meridian or Meta Robyn)" (Gemini 3.5 Flash, Attribution & MMM)
- "Google Meridian if you lack data or modeling support. Meridian is open source, not a turnkey measurement service." (GPT-6 Luna, Attribution & MMM)
- "open-source and free option... However, this requires data science expertise to implement." (Claude Haiku 4.5, Attribution & MMM)

## Movement since September 2026

Floor: 11 points of share, measured on the calibration repeat. A larger change is movement; a smaller one is noise.

- Attribution and marketing mix modeling: 3% to 5%, +2. Inside the floor by 9 points · rank 7 → 4 of 123.

## The company

Google; https://google.com; Mountain View, California, United States; founded 1998; part of Alphabet Inc.. From Wikidata, fetched 2026-09-14.

## 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, October 2026 Edition, gtm-ai-index.com.