What AI models does ZeroTwo support?

ZeroTwo provides access to ChatGPT-4, Claude, Gemini, and 30+ other leading AI models in one unified platform.

Is ZeroTwo better than ChatGPT?

ZeroTwo includes ChatGPT-4 plus many other AI models, allowing you to compare responses and choose the best AI for each task.

Can I use ZeroTwo for free?

Yes, ZeroTwo offers a free plan with access to multiple AI models. Pro plans start at $29.99/month.

How does Perplexity work?

Perplexity combines three pieces: (1) a search index over the public web, (2) a re-ranking layer that picks the best passages for your question, and (3) a language model that synthesizes those passages into a cited answer. Every claim in the response links to a numbered source, which makes Perplexity one of the most trust-friendly AI products for research. Perplexity Pro adds a choice of underlying models — GPT-5-class, Claude Sonnet 4-class, and its own Sonar Large — plus deeper research modes.

Yes — Perplexity has a genuinely useful free tier. You get unlimited quick searches, a limited number of Pro searches per day, and access to the default Sonar model. Perplexity Pro is $20 per month (or $200/year) and unlocks 300+ Pro searches per day, image generation, file uploads, and the ability to switch to frontier models like GPT-5 and Claude Sonnet 4.5.

Perplexity vs ChatGPT — which is better?

Perplexity wins for real-time research with citations. ChatGPT wins for open-ended chat, long-form writing, image generation, custom GPTs, and code. If your job is "answer a factual question with sources," Perplexity is the sharper tool. If your job is "help me think, write, and build," ChatGPT (and Claude, and Gemini) remain stronger. Many serious users run both — Perplexity for research, a general chat tool for everything else.

What is Perplexity Pro and is it worth it?

Perplexity Pro costs $20/month and unlocks model choice (GPT-5-class, Claude Sonnet 4.5, Grok, Sonar Large), 300+ Pro searches per day, deeper research mode, file uploads including PDFs, and Perplexity Pages. It's worth it for analysts, researchers, and anyone who hits the free-tier cap daily. If you already pay for ChatGPT Plus or Claude Pro, the math changes — ZeroTwo Pro ($29.99/mo) covers 60+ models in one place for people who want breadth over a single-product experience.

What is Perplexity Copilot?

Perplexity Copilot is the product's guided-search mode. Instead of answering immediately, it asks clarifying questions, runs multiple targeted searches, and assembles a longer, more structured answer. On Pro it uses the stronger underlying model you select. It is comparable in spirit to ChatGPT Deep Research and Gemini Deep Research.

Is Perplexity AI accurate?

Perplexity is more accurate than most chat-only products because every answer is grounded in cited web pages you can click through to. That said, the citations don't always support the exact claim made, so independent verification on anything important is still required. Perplexity publishes a help article on this and the product shows the source directly next to each claim.

Can ZeroTwo replace Perplexity?

Partially — not entirely. ZeroTwo gives you 60+ models (GPT-5, Claude, Gemini, Grok, Sonar) and web search in one place, which covers most of what people use Perplexity for. Perplexity is still the most polished pure answer engine. We recommend trying both: use ZeroTwo's multi-model chat for breadth and switching, and Perplexity when you want its signature research UX.

Answer engine · updated April 24, 2026

Perplexity AI — features, pricing, and the honest alternative

Perplexity is the best pure answer engine on the web. Here's what it does, how Perplexity AI compares to ChatGPT and Claude, and when a multi-model workspace beats a single product.

Ask anything across 60+ models — GPT-5, Claude, Gemini, Grok, Sonar…Ask

Ask anything across 60+ models See every model

TL;DR — Perplexity AI at a glance

Perplexity is an AI answer engine that reads the live web and returns cited paragraph answers. Perplexity AI started in August 2022, reached a reported $18B valuation, and is best in class for sourced research. For general chat, writing, and coding most people still pair it with ChatGPT or Claude — or use a multi-model workspace like ZeroTwo to get every model in one place.

OverviewResult 1

Perplexity AI, explained in one paragraph

Perplexity AI is an answer engine — a search product that reads the live web and returns a synthesized, cited paragraph instead of a ranked list of blue links. It was founded in August 2022 by former OpenAI and Meta researchers including Aravind Srinivas, and quickly became the default "serious research" alternative to ChatGPT. Every answer is grounded in numbered sources you can click, which is why journalists, analysts, and students use it heavily.

CompanyResult 2

How big is Perplexity?

Perplexity reached a reported $18 billion valuation in late-stage funding, according to Bloomberg^[1], and CEO Aravind Srinivas said in 2024 the product had passed 15 million monthly active users^[2]. It is one of the fastest-growing products in the AI-native search category alongside You.com, Arc Search, and Google's own AI Overviews.

MechanismResult 3

How Perplexity works under the hood

Perplexity chains three systems: a live web index, a passage re-ranker, and a language model. The ranker selects the most relevant snippets for your question, and the LLM synthesizes them into a cited answer. Free users get the Sonar model by default; Pro users choose between Sonar Large, GPT-5-class, Claude Sonnet 4.5, Gemini 2.5 Pro, and Grok. This is also why Perplexity ships with a dedicated crawler, PerplexityBot, which publishers can allow or block via robots.txt^[3].

Key takeaways

Perplexity AI was founded in August 2022 by Aravind Srinivas, Denis Yarats, Johnny Ho, and Andy Konwinski.
Pro costs $20/mo; Free is genuinely usable with unlimited quick searches.
Pro lets you pick between GPT-5-class, Claude Sonnet 4.5, Grok, and Sonar Large.
Best-in-class for sourced research; weaker for open-ended writing and code.
Reported ~$18B valuation and 15M+ MAU in 2024–2025 reporting.
ZeroTwo Pro includes Sonar plus 60+ other models for $29.99/mo.

What is Perplexity AI?

Perplexity AI is a conversational answer engine launched on August 30, 2022 by co-founders Aravind Srinivas (CEO, ex-OpenAI and DeepMind), Denis Yarats (CTO, ex-Meta AI), Johnny Ho, and Andy Konwinski^[4]. The pitch is simple and the product has stayed remarkably disciplined about it: you ask a question, the system runs real-time web searches, and a language model synthesizes the top passages into a cited paragraph answer.

The word perplexity itself is borrowed from information theory — it is a standard metric measuring how well a language model predicts text, with lower numbers meaning a more confident model. The brand is a deliberate nod to that lineage. In practice, most users never think about the metric; they think of Perplexity AI as "Google with a paragraph instead of links."

Aravind Srinivas has framed the goal plainly: "Our mission is to be the world's most trusted source of information — not to replace search, but to reinvent what an answer looks like."^[5]

Want to compare how multi-model chat handles the same research prompts? ZeroTwo lets you run the exact same question across GPT-5, Claude, Sonar, and Gemini side by side.

Perplexity vs ChatGPT vs Claude — when to use which

Each product is sharpest at a different job. Use this table as a decision framework rather than a scoreboard.

Job to be done	Best tool	Why
Sourced factual answer with citations	Perplexity	Answer engine with numbered sources next to every claim.
Open-ended writing, brainstorming, drafting	ChatGPT / Claude	Longer context, stronger prose, more creative latitude.
Coding and refactoring	Claude / GPT-5	Stronger on SWE-bench and real-world repo tasks.
Real-time news + social sentiment	Grok / Perplexity	Grok has X data; Perplexity has the freshest general web.
Switching between 5+ models mid-conversation	ZeroTwo	60+ models in one chat — GPT, Claude, Gemini, Grok, Sonar.
Long-document analysis (100+ pages)	Gemini 2.5 Pro	1M-token context handily beats Perplexity Pro limits.

Mid-page CTA

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ZeroTwo runs 60+ models — including Perplexity's Sonar family and every frontier model — in one chat.

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Perplexity Pro vs Free vs Enterprise — and ZeroTwo

Feature matrix updated April 2026. Perplexity pricing from perplexity.ai/pro.

Feature	Perplexity Free	Perplexity Pro	Perplexity Enterprise	ZeroTwo
Price	$0	$20/mo	Custom	$0 free / $29.99 Pro
Searches / day	Unlimited quick	300+ Pro	Unlimited	Generous free, unlimited Pro
Model choice	Sonar	GPT-5 / Claude / Sonar / Grok	All Pro + SSO	60+ models (GPT, Claude, Gemini, Grok, Sonar)
File uploads / PDFs	Limited	Yes	Yes	Yes
Image generation	No	Yes (FLUX, Playground, DALL·E)	Yes	FLUX, Imagen, GPT Image
Multi-model side-by-side	No	No (one at a time)	No	Yes

Note: Perplexity Copilot is included at both Free (limited) and Pro (full). The "Pro search" cap on Free is typically 5 per 4 hours; on Pro it lifts to 300+ per day.