Perplexity

Perplexity occupies a unique space in the AI landscape. It is not a general-purpose assistant like ChatGPT or Claude — it is an AI-powered search engine that combines the conversational interface of a chatbot with the source-citing rigour of academic research. When you ask Perplexity a question, it searches the web in real time, synthesises what it finds, and presents an answer with numbered citations you can verify.

What it does

Perplexity answers questions by searching the internet, reading the results, and synthesising a clear, sourced response. Every factual claim is linked to its source, so you can click through and verify. This addresses the single biggest problem with AI assistants: you never know if the answer is real or hallucinated. With Perplexity, you can check.

It supports follow-up questions that build on previous answers, creating a threaded research experience. You can upload files for analysis, and Pro users get access to multiple AI models (including GPT-4o, Claude, and others) for generating responses.

How it works in practice

The free tier is generous — you get unlimited basic searches and a limited number of Pro searches per day. Pro searches use more advanced models and search more sources for deeper, more comprehensive answers. The Pro plan ($20/month) unlocks unlimited Pro searches, file uploads, and access to multiple underlying models.

The interface is deliberately simple. There is a search bar. You type your question. You get an answer with sources. No complex setup, no system prompts, no custom instructions. This simplicity is intentional — Perplexity is designed for people who want answers, not people who want to tinker with AI.

Where it excels

For research, fact-checking, and learning about new topics, Perplexity is the best AI tool available. The citation system fundamentally changes the trust equation. Instead of wondering whether the AI is making things up, you can verify every claim. This makes it invaluable for professionals who need accurate, defensible information — lawyers, journalists, analysts, consultants, and anyone whose work requires getting the facts right.

The Spaces feature lets you create persistent research projects, building a knowledge base over time that you can return to and expand.

Where it falls short

Perplexity is not a creative tool. It will not help you brainstorm marketing campaigns, write fiction, or generate images. It is purpose-built for information retrieval and synthesis. If you need a general-purpose AI assistant for diverse tasks, ChatGPT or Claude will serve you better. Perplexity is a specialist, and it is best used alongside a generalist.

The business case

For any professional whose work involves research — and that covers most knowledge workers — Perplexity Pro at $20/month pays for itself within the first week. The Enterprise plan adds team features, SSO, and data privacy controls for organisations.