Perplexity

Perplexity is an AI-powered answer engine and search platform that combines large language models with real-time web search to deliver direct, cited answers to user queries. Founded in 2022 by Aravind Srinivas, Denis Yarats, Johnny Ho, and Andy Konwinski, the company processes hundreds of millions of queries per month and has grown into a $20 billion valuation as of 2025. Perplexity serves researchers, professionals, students, and developers who need fast, accurate, source-backed information without manually sifting through search results.

How It Works

Perplexity uses large language models from multiple providers, including OpenAI's GPT-5.5, Anthropic's Claude Opus 4.7, Google's Gemini 3.1 Pro, and its own Sonar models based on Meta Llama, to interpret user questions and search the live web for relevant content. The system then synthesizes findings into concise answers with inline citations, enabling users to verify sources directly. The platform supports follow-up questions, maintaining conversational context across a session.

Key Capabilities

Perplexity offers a research-focused search engine with several distinct modes. The standard search delivers quick cited answers across any topic. Pro search unlocks deeper reasoning and multi-step analysis using frontier models. Perplexity Pages generates structured, report-like documents that aggregate cited sources into readable summaries, useful for students, analysts, and content researchers. Internal Knowledge Search allows Pro and Enterprise users to search across uploaded documents (Excel, Word, PDF) alongside web content simultaneously. The platform also includes finance features for stock quotes, earnings data, and peer comparisons; a Shopping Hub for AI-curated product recommendations; and the Model Council feature that lets users compare outputs from multiple LLMs side by side.

Products and Platform

Perplexity provides a free web and mobile search experience with a freemium model. The free tier includes core search capabilities with Sonar models, while Perplexity Pro ($20/month) unlocks access to frontier models, file uploads, higher query limits, and priority support. Enterprise Pro adds team management, enhanced security, and data protection controls. Beyond the consumer product, Perplexity offers a Search API and an Agent API for developers, providing programmatic access to its real-time search infrastructure, web search tools, and embeddings for semantic search and RAG pipelines. In 2025, Perplexity launched Comet, an AI-native Chromium-based browser with deep Perplexity integration for article summaries, image analysis, and task automation.

Use Cases

Researchers and analysts use Perplexity for rapid literature reviews and fact-checking with verifiable citations. Students leverage Perplexity Pages to generate structured study materials. Developers integrate the API into AI-powered search and research applications. Professionals rely on Internal Knowledge Search to query across company documents and the web simultaneously. Finance professionals track real-time market data and company earnings. Shoppers use the AI-curated Shopping Hub to discover products with recommendations backed by Amazon and Nvidia.

Privacy and Security

Perplexity offers a subscription-first model that deprioritizes advertising revenue in favor of user trust. The platform processes queries through encrypted connections. Enterprise Pro customers receive additional data protection guarantees. Perplexity has attracted legal scrutiny from publishers regarding content use and web crawling practices, with ongoing litigation and revenue-sharing publisher programs as responses to these concerns. The company publishes its crawler IP ranges and user-agent strings publicly, though independent analyses have identified undisclosed crawling methods.