Perplexity AI

The distinction that matters here is between reasoning models and retrieval models. ChatGPT and Claude are fundamentally reasoning tools — they generate based on training. Perplexity is a retrieval tool — it searches the live web and synthesises sourced answers. For advertising professionals doing research that needs to be defensible — market sizing, competitive positioning, consumer trend analysis, category intelligence — the citation model is critical. You get the answer and the sources simultaneously, which means you can substantiate your claims in a briefing or proposal rather than hoping the LLM was trained on accurate data. The Pro version adds significantly more depth. I use it whenever the brief requires facts rather than generated text, and I would recommend it as a core research tool for any strategy, planning, or new business function.