How to Measure AI Share of Voice

If GEO has one headline metric, it’s AI Share of Voice (SOV): how often, and how prominently, your brand shows up in AI answers compared with competitors — across engines and across the questions your buyers actually ask.

It’s intuitive enough for a board slide and rigorous enough to act on. Here’s how to compute it without fooling yourself.

The inputs

AI SOV rolls up several signals captured per response:

• Mention rate — the share of relevant prompts where you appear at all.
• Position — first mention vs. buried near the end.
• Sentiment — positive, neutral, or negative framing when mentioned.
• Recommendation strength — named as the top pick vs. listed as an also-ran.

Weight and combine these and you get a single comparable score per engine, and an overall figure across engines.

The prompt corpus is everything

Your score is only as good as the prompts behind it. A useful corpus is:

• Representative — 200–500 prompts spanning problem-, solution-, brand-, and comparison-aware intent.
• Category-specific — the real questions buyers ask, not generic keywords.
• Tagged — so you can slice SOV by intent stage and see where you’re weak.

Why you must sample repeatedly

The single biggest measurement mistake is trusting one run. Ask the same model the same question twice and you’ll often get different vendors named. A single sample can make you look like a category leader or invisible — purely by chance.

The fix is volume: query each prompt multiple times across every engine over a window (we use 14 days), then aggregate. Repeated sampling turns a noisy signal into a stable, trustworthy number.

Track leading indicators, not just SOV

SOV itself is partly a lagging metric — it moves as engines and their sources update, which takes 60–120 days. To see progress sooner, watch the components that move first:

• mention rate
• citation count
• prompts-where-mentioned

These lead the overall score and tell you whether your work is landing well before the headline number catches up.

Make it comparable and repeatable

The point of a defined methodology is that the number means the same thing every time. Same corpus, same engines, same sampling, period over period. That’s what makes AI SOV something you can manage, not just admire.

See your own AI Share of Voice with a free visibility check, or read the full methodology.