Measurement here is still emerging, and nobody has a clean analytics equivalent of Google Search Console yet. The practical approach right now is manual and repeated: ask ChatGPT, Perplexity, Gemini, and Claude your target questions on a schedule, log whether and how your brand gets mentioned, and track it as a directional trend — sometimes called tracking share of model — rather than a precise number.
A few emerging tools attempt to automate this at scale, but in our experience the manual-prompt method is still the most reliable starting point for a small or mid-size business.