Set up a question panel
Write 20 to 50 questions across the buying journey: 'what is', 'how much does', 'best provider in Singapore for', 'X vs Y'. Run each one in each AI tool on a schedule, ideally from a clean session, because answers vary by user and over time. Record mentions, position in the answer, accuracy of the description and the sources cited.
The cited sources are as useful as the mentions: they show which third-party sites you need to appear on.
Combine with analytics
Check referral traffic from chatgpt.com, perplexity.ai and similar domains in your analytics, and watch branded searches in Google Search Console, since people often hear about a business in an AI answer and then search for it by name. Ask new leads how they found you; 'ChatGPT recommended you' is a signal no tool will capture for you.
ForceMX's Marketing department reports AI mentions monthly alongside rankings and leads.