Should You Trust the GEO Agencies AI Recommends?
Why the list changes every time you ask, and four things you can check on an agency's own homepage before you ever talk to them.
Ask ChatGPT, Gemini, or Perplexity to recommend a GEO agency in Korea, and you'll get names. Ask again, or ask a different service, and the names shift. Treat that list as a starting point for research, not as an answer that's already chosen your vendor.
Why the list keeps changing
Generative AI doesn't give the same answer to the same question every time. On top of that, many GEO agencies publish their own "Top 5 GEO Agencies" posts on their own blogs and websites, and writing that kind of post is itself part of the work of getting their own name into AI answers. What an AI recommends can be as much a reflection of that self-promotion as of actual reputation.
So rather than picking a vendor because a name showed up once, it's worth filtering further using what you can verify directly on that agency's own site.
What you can check from the homepage alone
A few things are usually verifiable before you ever reach out.
How much is bundled into one contract. Some agencies handle site fixes, content, earning outside mentions, and post-work measurement all under one engagement; others write content and leave the rest as guidance only. That difference determines how much actually gets done.
Which AI services they say they track. Many only mention ChatGPT and Perplexity; fewer explicitly cover Gemini, Claude, or Copilot. Check whether the services they track overlap with what your own customers actually use.
Whether they have a case study in your industry. A vague claim of "case studies available" is less useful than a page that names the industry and the specific outcome.
Who fixes a problem once it's found. Some agencies can edit your site directly within the engagement; others can only report an issue and leave the fix to your own dev team. That changes how fast anything actually gets resolved.
If you want to check this yourself
To see which agencies AI actually recommends, keep the conditions fixed so results are comparable: stay logged out, start a new conversation each time, use the exact same question, skip follow-up questions, and repeat it several times (around five). Judging which agency "wins" from a single answer is no different from flipping a coin once and calling it a trend. Running the same check across multiple AI services, not just one, also lets you tell apart a name that only shows up on one engine from one that appears consistently across several. A similar method works for checking your own company's visibility — see How to Check Whether Your Company Shows Up in AI Answers for a concrete tracking format.
What matters more than whether a name showed up in an AI answer is how many times it showed up under fixed conditions, and what that agency actually states on its own site — that's the information that's actually useful for making a decision.