Perplexity AI

Perplexity AI is an AI-powered “answer engine” that combines conversational search with real-time web browsing. Instead of listing links, it delivers direct, concise answers with clear source references. Launched in late 2022, Perplexity uses advanced language models like GPT-4.1, Claude 4.0, and its own proprietary models to understand queries, find accurate information, and present it in a natural, readable format. It follows a freemium model: free for basic use, while the Pro version unlocks premium AI models, file uploads, API access, and powerful tools for in-depth research.