u/gervazmar

The question I keep getting: "We're running paid + seo in Germany/Spain/France/etc. Is it worth producing localized on-page and off-page content specifically for LLMs (ChatGPT/GoogleAIOverview/...) or is English sufficient?"

We pulled 7M AI citations from 350K prompts across Google AI Overview, Copilot, ChatGPT, and Grok in 6 non-English languages to find out.

Short answer: yes, but the payoff swings 30+ points depending on which AI search engine your audience uses.

Local language citation rate x model:

Market	Google AIO	Copilot	ChatGPT	Grok
Italian	90%	77%	74%	54%
German	90%	76%	66%	49%
Spanish	83%	84%	75%	55%
French	82%	87%	72%	59%
Swedish	85%	60%	57%	47%
Dutch	81%	66%	62%	38%

(Read it as: "if I produce German content, what % of the sources cited for German prompts will be in German?")

A practical rule of thumb from the data:

• Audience mostly on Google AIO → local content has a ~80-90% hit rate across the board. Invest.
• Audience split across engines → safest bet is bilingual content (strong local + strong English), especially for Germanic markets.

Does this match what anyone here is seeing?

Disclosure: I work at Temso AI (we build AI Agents for GEO/AEO). We used our infrastructure to collect and analyze the data. Data's ours. In case you are interested in our methodology just let me know.*