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.

Is Perplexity AI a chatbot?

Not exactly. A chatbot like ChatGPT or Claude is built around open-ended conversation; Perplexity AI is built around answering a question with cited sources. Both share the same underlying language-model technology, but the product surface, optimization goals, and trust model are different.

What is Sonar in Perplexity AI?

Sonar is Perplexity's family of in-house language models, tuned specifically for grounded answer generation. The lineup includes Sonar (default fast), Sonar Pro (higher-quality answers), Sonar Reasoning (chain-of-thought), and Sonar Deep Research (autonomous research agent).

Pro Search is Perplexity AI's guided-search mode. Instead of answering immediately, it asks clarifying questions, runs multiple targeted searches, and assembles a longer structured answer. Free users get a small daily allowance; Pro users get 300+ Pro Search queries per day.

What is Perplexity Deep Research?

Deep Research is Perplexity AI's autonomous research agent. It runs many searches in sequence, reads source pages, and outputs a long sectioned report with citations — comparable to ChatGPT Deep Research and Gemini Deep Research.

How accurate is Perplexity AI?

Perplexity AI is generally more accurate than chat-only products on factual questions because every claim links to a citation a reader can verify. That said, citations don't always perfectly support the exact claim; serious users still verify load-bearing facts.

Can I use the Sonar models elsewhere?

Yes — Sonar is exposed via Perplexity's API, and aggregators like ZeroTwo bundle Sonar alongside GPT-5, Claude, Gemini, and Grok so you can switch between them in a single chat. That makes side-by-side evaluation of Perplexity AI's answers vs. a frontier model trivial.

Does Perplexity AI replace Google?

For factual lookups with sources, many users have switched. For navigational queries ("open my bank's login page"), shopping, and local maps, Google still wins. Treat Perplexity AI as the answer layer, not a full search-engine replacement.

Product brief · April 24, 2026

Perplexity AI is not a chatbot.It is an answer engine.

A field guide to Perplexity AI as a product: the Sonar model lineup, Pro Search, Deep Research, what an "answer engine" really means, and where Perplexity AI fits next to GPT-5, Claude, and Gemini.

Try Sonar Pro + GPT-5 + Claude in one chat — free Compare ZeroTwo vs Perplexity Pro

Founded: Aug 2022
Reported valuation: $18B
Model family: Sonar
Pro pricing: $20 / mo

TL;DR

Perplexity AI is an AI answer engine — not a chatbot — built around a search index, a passage re-ranker, and a language model that produces cited paragraph answers. Perplexity AI ships its own Sonar model lineup, plus Pro Search and Deep Research modes. Use it for sourced research, and pair it with a frontier chatbot for everything else.

Key takeaways

Answer engines optimize for cited paragraphs, not open chat.
Sonar is Perplexity AI's in-house LLM family (4 variants).
Pro Search runs multi-step search; Deep Research writes reports.
Pro is $20/mo and unlocks GPT-5, Claude, Sonar Pro, and Grok.
ZeroTwo bundles Sonar with 60+ other models in one chat.

Chapter 01

What is Perplexity AI?

Perplexity AI is an AI answer engine: ask a question in natural language, and a language model writes a paragraph answer grounded in live web sources, with a numbered citation next to every claim. The product launched on August 30, 2022, founded by Aravind Srinivas (ex-OpenAI), Denis Yarats (ex-Meta AI), Johnny Ho, and Andy Konwinski^[1]. It has since been reported by Bloomberg at an $18B valuation^[2].

The name is a deliberate nod to the information-theory metric: a language model's perplexity measures how surprised it is by the next token, and lower numbers mean a more confident model. Aravind Srinivas has described the mission as "reinventing what an answer looks like" — explicitly not framing the product as a Google replacement.

The important conceptual move is the category. ChatGPT, Claude, and Gemini are chatbots: they optimize for conversation, drafting, and reasoning over arbitrary prompts. Perplexity AI is an answer engine: it optimizes for the shortest path from a factual question to a sourced answer. The underlying technology overlaps; the product surface and the trust model do not.

Chapter 02

Answer engine vs chatbot vs research agent

Three product patterns, three optimization targets. Most modern AI tools are a blend, but Perplexity AI sits firmly on the answer-engine side — and ships a research-agent variant on top.

Capability	Chatbot (ChatGPT, Claude)	Answer engine (Perplexity AI)	Research agent (Deep Research)
Live web access	Sometimes	Always	Always
Inline numbered citations	Rare	Yes — every claim	Yes — full bibliography
Conversational follow-ups	Yes	Yes	Limited
Long-form drafting	Strong	Light	Strong (report style)
Multi-search planning	No	Implicit (single pass)	Explicit (multi-pass)
Output structure	Free-form	Paragraph + citations	Sectioned report

A useful heuristic: if your job ends in a quote with a source, an answer engine is the right tool. If your job ends in a draft, a chatbot probably is. Skip the Perplexity Pro tax — get Sonar + GPT-5 + Claude on ZeroTwo and switch mid-thread without leaving the conversation.

Chapter 03

The Sonar model family

Perplexity AI ships its own line of language models, branded Sonar, tuned specifically for grounded, citation-heavy answers. The lineup ladders from fast lookups to long autonomous research^[3].

Sonar

Default fast answer model

Perplexity AI's in-house base model — tuned for speed and citation accuracy on everyday research questions. Free-tier default.

Best for: Quick lookups, definitions, recent news
Speed: Fast
Context: 32K

Sonar Pro

High-quality grounded answers

Larger Sonar variant with stronger reasoning and longer answers. Powers Perplexity Pro Search and is available via API.

Best for: Multi-step research, comparative analysis
Speed: Medium
Context: 200K

Sonar Reasoning

Chain-of-thought search

Reasoning-tuned Sonar that thinks before it cites. Produces visibly structured answers with intermediate steps.

Best for: Complex questions where logic > recall
Speed: Slower
Context: 128K

Sonar Deep Research

Autonomous research agent

Runs dozens of searches, reads sources, and produces a long structured report — comparable in spirit to ChatGPT Deep Research and Gemini Deep Research.

Best for: Reports, briefs, market scans
Speed: Minutes
Context: 200K+

Skip the Perplexity Pro sub

Get Perplexity-style search + every other frontier model — $19.99/mo.

ZeroTwo bundles Sonar Pro with 60+ frontier models — GPT-5, Claude 4.5 Sonnet, Gemini 2.5 Pro, Grok 4. One bill, cited answers, and you switch models mid-thread.

Try every model free — no credit card Switch mid-thread, keep your context

Chapter 04

Pro Search and Deep Research, explained

Pro Search

Pro Search is Perplexity AI's guided multi-search mode. Instead of returning the first answer it can find, the system asks a clarifying question or two, then issues several targeted web searches before synthesizing a longer, structured answer.

Free users get a small daily allowance (typically 5 Pro Search queries every 4 hours). Pro subscribers get 300+ per day plus the option to choose the underlying model — Sonar Pro, GPT-5 class, Claude Sonnet 4.5, or Grok.

Deep Research

Deep Research is Perplexity AI's autonomous research agent. It plans a research outline, runs dozens of searches in sequence, reads the source pages, and assembles a long structured report with a real bibliography. Comparable in spirit to ChatGPT Deep Research and Gemini Deep Research.

Useful when you need a starting brief, a market scan, or a sourced literature review. Treat the output as a research draft — citations are real, but the synthesis still needs human judgment before it ships.

Chapter 05

Free, Pro, and Enterprise

Free

Unlimited quick searches with default Sonar
Limited Pro Search uses per day
Basic file uploads

Pro

$20 / mo

300+ Pro Search queries / day
Pick GPT-5-class, Claude Sonnet 4.5, Sonar Pro, or Grok
Image generation + larger file uploads + Spaces

Enterprise

Custom

SSO, SOC 2, admin controls
Increased data retention controls
Internal knowledge connectors

Perplexity Pro pricing per perplexity.ai/pro. Already paying for ChatGPT Plus or Claude Pro? Get all of them on ZeroTwo Pro for $19.99/mo — Sonar, GPT-5, Claude 4.5, Gemini 2.5 Pro, Grok 4, and 60+ more.

Chapter 06

Who Perplexity AI is for

The analyst

You spend the day collecting evidence. Perplexity AI's grounded answer pattern saves hours over copying-and-pasting links from Google.

The journalist

You need fresh sources you can quote. Inline citations let you click straight to a primary source rather than re-searching what the model paraphrased.

The student

You're building a reading list. Sonar Deep Research drafts a sectioned report with a real bibliography — the right starting point, not the final answer.

The builder

You want one workspace for everything. Pair Perplexity AI for sourced research with a multi-model chat for code, drafting, and brainstorming.

Sources

FAQ

Frequently asked questions

Published April 24, 2026 · Last updated April 24, 2026

Skip the Perplexity Pro tax. Get every model for $19.99.

Sonar Pro for sourced research. GPT-5, Claude 4.5 Sonnet, Gemini 2.5 Pro, and Grok 4 for everything else — all on ZeroTwo, in a single chat, on a single bill.

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