Perplexity

Leading AI-native answer engine; primary non-Google/Bing search challenger in the generative AI era; central reference point for GEO strategy and AI search monetization debate

Perplexity is an AI-powered conversational search and answer engine founded in 2022 by Aravind Srinivas (CEO, formerly of OpenAI and DeepMind), Denis Yarats, Johnny Ho, and Andy Konwinski. Rather than returning a list of links, Perplexity synthesizes real-time web information into direct, cited answers, positioning itself as a fundamental challenger to Google's traditional search paradigm. The company raised approximately $1.72 billion at a ~$22.6 billion valuation as of January 2026, backed by investors including SoftBank, IVP, and Jeff Bezos, reflecting enormous market confidence in AI-native search as a category. In November 2024, Perplexity launched a formal advertising platform featuring 'Sponsored Questions' — branded prompts surfaced within search results — in partnership with Criteo, Indeed, and WPP. The model was designed to insert advertiser-relevant queries into the answer-engine experience without disrupting the core UX. However, by February 2026, Perplexity abandoned the advertising program entirely, with leadership citing concerns that ads fundamentally undermined user trust in the objectivity of AI-generated answers. This decision reverberated across the AdTech industry as a high-profile signal that the ad-supported model may be structurally incompatible with answer-engine interfaces. For the AdTech ecosystem, Perplexity remains critically relevant on multiple fronts: it is the canonical platform target for Generative Engine Optimization (GEO) and AI visibility strategies, as brands compete to be cited in AI-generated answers. Its browser project, Comet, represents a potential browser-layer disruption to traditional ad delivery and tracking infrastructure. And its failed ad experiment has become the industry's reference case for the tension between AI search monetization and user trust — a debate that will shape how Google, Microsoft, and emerging AI search players approach advertising integration.