Perplexity

Overview

Perplexity is the leading AI answer engine, combining live web search with LLM reasoning to produce concise, citation-backed answers. Unlike traditional search engines, it synthesizes information from across the web into a direct response with sources you can verify. The platform supports multiple AI models including GPT-5.2, Claude Sonnet 4.6, and Gemini 3.1 Pro Thinking, letting you switch based on the task. Key features include Deep Research for multi-step iterative investigations, Perplexity Computer for automating complex tasks, and Spaces for collaborative research. Pro subscribers ($17/month billed annually) access advanced models, deeper sourcing from Pitchbook and Wiley, and usage limits suitable for most users. The Max plan ($167/month billed annually) unlocks the highest usage limits, 10,000 monthly Computer credits, advanced reasoning models, and Model Council for side-by-side multi-model comparison.

Features

• Real-time web search -- Pulls live web results into every answer for up-to-date, fact-based responses
• Cited answers -- Every claim links to a source URL letting users verify the underlying data
• Deep Research mode -- Multi-step iterative research producing comprehensive cited reports (Pro+)
• Multi-model access -- Choose from GPT-5.2, Claude Sonnet 4.6, Gemini 3.1 Pro Thinking, Grok 4.1, and Sonar per task (Pro+)
• Document analysis -- Upload PDFs and spreadsheets for AI-assisted analysis alongside web context
• Perplexity Computer -- Automate complex multi-step tasks using AI agents (Pro+)
• Perplexity Spaces -- Collaborative research workspaces with shared notes and searches (Pro+)
• Model Council -- Compare responses across multiple AI models side by side (Max)
• Perplexity Finance -- Dedicated financial data view with stock heatmaps and market analysis
• Sonar API -- Developer access to retrieval models for building custom search-augmented applications
• Focus modes -- Direct searches to academic papers, YouTube, Reddit, or news specifically
• Conversation memory -- Tracks prior messages for context-aware follow-up queries within a session

Best For

Researchers and analysts who need citation-backed answers for professional or academic work, Students doing research who need verifiable sources alongside synthesized answers, Professionals conducting competitive research, market analysis, or due diligence, Developers building search-augmented applications via the Sonar API, Teams conducting collaborative research using Spaces and shared repositories

How It Works

You type a question or research prompt and Perplexity runs live web searches in parallel, pulling from its web index and authoritative sources. Results are passed to the language model, which synthesizes a clear answer and appends inline citations from the original sources. Every claim links back to a specific source URL you can click through to verify. For Deep Research mode, Perplexity breaks your question into sub-queries, searches iteratively, evaluates retrieved information for consistency, and compiles a comprehensive cited report. You can upload PDFs, spreadsheets, and documents to analyze alongside web results. Conversation history is tracked within threads so follow-up questions build on prior context. Model Council (Feb 2026) lets Max subscribers send queries to multiple AI models simultaneously and compare responses side by side.

Frequently Asked Questions

Is Perplexity free?

Yes. The free plan includes unlimited basic searches and a limited number of advanced searches per day with access to Perplexity's default model. The Pro plan at $17/month (billed annually) unlocks advanced AI models, Perplexity Computer, and deeper sourcing from premium data providers.

How is Perplexity different from Google Search?

Google returns a list of links. Perplexity synthesizes those sources into a direct cited answer. It's faster for getting a researched summary but doesn't replace reading primary sources for detailed or legally sensitive work.

What is Deep Research?

A Pro feature that breaks your query into sub-questions, searches iteratively, and compiles a comprehensive cited report. It's similar to having a research assistant spend hours on a topic — you get a full document rather than a single answer.

Can Perplexity analyze documents?

Yes. You can upload PDFs, spreadsheets, and documents on Pro plans. Perplexity analyzes them alongside its web search results. File uploads are limited on the free plan (5 per day).

Does Perplexity hallucinate?

Like all LLMs, it can make errors. The citation system reduces risk because every claim points to a source — but you should verify important facts independently. Deep Research mode is more reliable for complex topics.

What is the Sonar API?

A developer API offering pay-as-you-go access to Perplexity's search-augmented retrieval models. It's designed for building custom applications that need live web-grounded AI responses.