Perplexity and ChatGPT are both $20 per month at the paid tier and both use frontier AI models, but they solve different problems and the overlap between them is smaller than it looks.
Perplexity is a search tool with AI capabilities. Every response includes numbered citations with links you can click to verify the source, and the web index is live by default. If your primary use case is research, fact-checking, competitive intelligence, or answering specific questions about current events, Perplexity is the better tool. Pro unlocks unlimited advanced queries, model switching between GPT-5.5, Claude, and Gemini, and 300 monthly AI reports. The free tier caps you at 5 advanced queries per day, which is tight for regular use. Perplexity is not built for long-form creative or coding tasks; that is simply not what it is designed to do.
ChatGPT is a general-purpose AI companion built for a much wider range of tasks. The Plus plan at $20 per month gives you GPT-5.5, Sora for video generation, Codex for coding tasks, and 10 Deep Research runs per month. For writing, coding, analysis, image generation, and multi-step agent tasks, ChatGPT Plus covers the overwhelming majority of professional workloads. The free tier has deteriorated: US users now see ads and face a 5-hour message window, which makes it impractical for sustained daily use.
If you already pay for ChatGPT Plus and are considering adding Perplexity, that subscription overlap is real. For most people, one or the other is sufficient. If your work centers on research and sourced answers, Perplexity is the better fit. If you need a general-purpose AI assistant that can write, code, reason, and generate images, ChatGPT Plus is the more versatile choice at the same price point. Power researchers sometimes pay for both; most people should pick the one that matches their primary use case.