Fans out across engines
Every plan checks ChatGPT, Perplexity and Gemini through their search-grounded APIs, and Google AI Overviews and Google AI Mode from Google's own results page. The five often cite different pages for the same question, which is the reason to check more than one. Claude is a paid add-on. Grok is sold as a pack of 20 prompts a week, because on our own 36-question run it cited X only on sentiment questions and never on a buying or fact-check one. Copilot is not measured.