GEO Agencies & Services: How to Choose a Generative Engine Optimization Partner

Generative engine optimization has crossed the line from experiment to service category. Brands are hiring agencies to get them mentioned by ChatGPT, Gemini, and Perplexity the way they once hired agencies for Google rankings, and a wave of providers has appeared to meet the demand, ranging from excellent to purely opportunistic. This guide covers what GEO services actually include, when hiring an agency beats doing it in-house, and how to tell the serious providers from the ones selling repackaged SEO.

What GEO Services Actually Cover

A complete generative engine optimization engagement has four parts:

• Measurement. Establishing where the brand stands: which prompts mention it, at what rate, against which competitors, across which AI engines. Everything else depends on this baseline, which is why serious providers start here rather than with content.
• Source strategy. Identifying the pages AI models cite in the category (review platforms, comparison sites, communities, editorial rankings) and building a plan to earn presence on them. In most categories, a small set of heavily-cited pages controls the answers.
• Content work. Creating and restructuring content so models can extract and cite it: direct answers to buyer questions, comparison pages, structured data, and coverage of the topics where the measurement shows gaps.
• Ongoing tracking. AI answers shift with model updates and new content. Monthly reporting on mention rates, competitor movement, and source changes is what separates a program from a one-off project.

If a proposal is missing the first or last part, you're buying content production, not GEO.

Agency, In-House, or Tooling?

The honest answer is that the measurement layer is a platform problem, not a people problem: no agency can hand-check hundreds of prompts across three engines and multiple markets every day. The real question is who acts on the data.

• In-house with a platform fits teams that already own SEO and content. AI visibility tracking plugs into the existing workflow, and the platform's weekly reporting replaces the agency retainer.
• Agency plus platform fits teams without content capacity, or agencies already running the brand's SEO. The agency executes the source and content strategy; the platform keeps both sides honest about whether it's working.
• Agency alone, without measurement, is the arrangement to avoid. Neither side can tell whether the work moved anything.

Red Flags When Evaluating GEO Providers

• Guaranteed placement. Nobody can guarantee that ChatGPT will recommend a brand. Answers are probabilistic and change with model updates. A provider promising "#1 in ChatGPT" is promising something they don't control.
• No baseline measurement. If the engagement starts with content deliverables instead of an audit of current visibility, sources, and competitors, the strategy is generic by construction.
• SEO deliverables with new labels. Keyword rankings and domain authority are not AI visibility metrics. The relevant numbers are mention rate, position in answers, competitor share, and citation sources.
• One-time optimization. A brand's AI visibility a month after the project ends is the only result that matters, and it requires ongoing tracking by definition.

Questions That Sort the Field Quickly

• Which prompts will you track for us, and how did you choose them?
• Which sources currently drive AI answers in our category?
• How do you measure results, and can we see the dashboard ourselves?
• What happened to your other clients' mention rates over six months?

Strong providers answer all four with specifics. Weak ones pivot to content volume and publishing cadence.

Where to Find Agencies That Already Do This

We maintain a partner directory of agencies and consultants who run their clients' AI visibility programs on GetMentioned, which means they work measurement-first by default: every recommendation they make is tested against real prompt-level tracking across ChatGPT, Gemini, and Perplexity. If you're a brand, it's a shortlist of providers whose work you can verify in the data. If you're an agency building a GEO practice, the partner program is how you get listed.

Frequently Asked Questions

What does GEO cost compared to SEO?

Engagements currently mirror SEO retainers, typically from around €1,000 per month for a consultant-led program to five figures for multi-market enterprise work. The tooling layer is separate and comparatively cheap; AI visibility tracking starts at €89 per month, which is also why measurement is worth owning even if you outsource execution.

Do I need a GEO agency if I already have an SEO agency?

Often your SEO agency can become your GEO provider, since the disciplines overlap heavily on content and authority building. What they need is the measurement layer and category source data. Pointing them at the answers your buyers actually see is a faster path than hiring a second agency.

How long until GEO work shows results?

Source-level wins (getting added to a heavily-cited comparison page, for example) can show up in answers within weeks. Category-level visibility shifts typically take one to two quarters of consistent work. Anyone quoting days is measuring something other than AI answers.

Start With the Baseline

Whether you hire a partner or build in-house, the first step is the same: generate a free AI visibility report to see where your brand stands today, then decide who closes the gaps. If you'd rather have help, browse the partner directory.