Which AI search engine is the best at citing sources?

Perplexity is built around citations, every answer carries numbered, clickable sources, and it does so on the free tier. ChatGPT Search, Gemini AI Mode, Copilot and Claude all link sources inline too. If your priority is checking where a claim came from (for a literature review or report), start with Perplexity, then cross-check on a second engine.

Is Perplexity better than ChatGPT for search?

For a quick, cited answer with sources laid out, Perplexity is usually faster and cleaner. For search woven into a longer conversation, drafting, coding, follow-ups, ChatGPT Search wins because it sits inside the full ChatGPT. Both have free tiers, so the honest answer is to try the same question on each. Many people keep both.

Is there a free AI search engine?

Yes, most of them have a free tier. Perplexity, ChatGPT Search, Google Gemini (and AI Mode in Search), Microsoft Copilot, Grok and Claude all answer with live web results for free, with daily limits on the advanced model or deep-search mode. DeepSeek's web chat is free with no subscription tier. Use the "Free tier only" filter above to see all 7 at a glance.

Which AI search engines show their sources?

All seven engines in the table mark citations as a capability. The difference is presentation: Perplexity and Claude foreground numbered inline citations; Gemini's AI Mode and Copilot show footnoted links; Grok cites X posts and web pages. Turn on the "Shows citations" filter to confirm, and always click through, because AI answers can misattribute a source.

Does Google's AI Mode replace normal search?

Not entirely. AI Mode and AI Overviews sit on top of Google Search. They generate a written answer with source links, but the classic blue-link results are still there below. For navigational queries (find a specific site) plain search is faster; for research questions the AI answer saves clicks. You can use both on the free tier.

How accurate are the LKR prices on this page?

The LKR column is indicative only. It multiplies the provider's published USD price by a fixed CBSL middle rate of Rs 300 per USD, not a live exchange feed. Your card will be billed in USD, and your bank adds an FX margin (typically 1.5–3%) plus card fees. For a live rate, use the Freelancer USD-LKR calculator linked in Related tools.

Do these AI engines train on my conversations?

It varies, and the table's last column shows each provider's default. Several (Perplexity, ChatGPT, Gemini, Copilot, Grok, Claude) train on consumer chats unless you opt out in settings; DeepSeek's policy uses your inputs by default. If your queries contain anything sensitive, turn off training/history in the app, or use a team/enterprise plan where data is excluded from training.

Which engine is best for real-time information?

Grok has the tightest real-time loop because it reads X (Twitter) directly alongside the web, so it surfaces breaking discussion quickly. Gemini (grounded in Google Search) and Copilot (Bing) are also strong for current events. All of them beat a plain chatbot with no web access. For a fast-moving topic, prefer an engine with real-time web turned on and check the timestamps on its sources.

When were these plans and prices last verified?

The plans, prices, citation behaviour and data-training policies were last cross-checked against each provider's official page on 2026-06-30. The dataset is reviewed quarterly and after any plan or pricing change. Spot a stale figure? Email me with the source and I'll fix it within 24 hours.

AI · Answer engines

AI Search Engine Comparison, Perplexity vs ChatGPT vs Gemini vs Grok

Compare 7 consumer AI answer engines side by side, free tier, paid price in USD and LKR, citations, real-time web, file and image upload, API and data-training policy. Filter to the ones that fit, then price a subscription. Every figure cites its official source.

By Induwara Ashinsana— Co-Founder, Ryzera TechnologiesUpdated Jun 30, 2026

Compare AI answer engines7 engines

Best for…

Best free + citations

Perplexity

Cited answers on the free tier, no card needed.

Best for research

Claude (web search)

Long-document analysis with inline source citations.

Best real-time

Grok

Live answers straight from X and the web.

Best inside your stack

ChatGPT Search

Search built into the ChatGPT most people already use.

Filter & sort

Sort

Comparison (7 of 7)

Engine	Free tier	Paid from	Citations	Real-time web	File/image	API	Trains on data
ChatGPT Search OpenAI GPT-5 / GPT-4o with web search	Search available to signed-in free users; rate-limited	$20.00/mo	Yes	Yes	Yes	Yes	Trains unless you opt out
Claude (web search) Anthropic Claude Opus 4.5 / Sonnet 4.5	Web search on the Free plan in supported regions; rate-limited	$20.00/mo	Yes	Yes	Yes	Yes	Trains unless you opt out
DeepSeek DeepSeek DeepSeek-V3 / R1 with search	Free web chat with search; no consumer subscription tier	Free	Yes	Yes	Yes	Yes	Trains on your chats
Google Gemini / AI Mode Google Gemini 2.5 Flash / Pro	Gemini app, AI Overviews and AI Mode in Search are free	$19.99/mo	Yes	Yes	Yes	Yes	Trains unless you opt out
Grok xAI Grok 4	Free on grok.com and inside X, with rate limits	$30.00/mo	Yes	Yes	Yes	Yes	Trains unless you opt out
Microsoft Copilot Microsoft GPT-5 / GPT-4o with Bing search	Free Copilot with web grounding; daily limits on the advanced model	$20.00/mo	Yes	Yes	Yes	No	Trains unless you opt out
Perplexity Perplexity AI In-house Sonar + GPT, Claude, Gemini (Pro model picker)	Unlimited quick searches; a few Pro (deep) searches per day	$20.00/mo	Yes	Yes	Yes	Yes	Trains unless you opt out

Each engine's claims trace to its official source, see the Sources section below the tool.

Engine details

ChatGPT SearchOpenAI

Search inside the ChatGPT you already use, links sources inline.

CitationsReal-time webFilesImagesAPI

Model

GPT-5 / GPT-4o with web search

Platforms

Web · iOS · Android

Paid from

$20.00/mo

Trains on data

Trains unless you opt out

Free: freePlus: $20.00/moTeam: $30.00/mo

Official source

Claude (web search)Anthropic

Careful, citation-backed answers for long documents and analysis.

CitationsReal-time webFilesImagesAPI

Model

Claude Opus 4.5 / Sonnet 4.5

Platforms

Web · iOS · Android

Paid from

$20.00/mo

Trains on data

Trains unless you opt out

Free: freePro: $20.00/moMax: $100.00/mo

Official source

DeepSeekDeepSeek

A capable free answer engine; cheapest pay-per-token API for devs.

CitationsReal-time webFilesImagesAPI

Model

DeepSeek-V3 / R1 with search

Platforms

Web · iOS · Android

Paid from

Free

Trains on data

Trains on your chats

Free: free

Official source

Google Gemini / AI ModeGoogle

Answers grounded in Google Search, plus AI Mode in normal Search.

CitationsReal-time webFilesImagesAPI

Model

Gemini 2.5 Flash / Pro

Platforms

Web · iOS · Android

Paid from

$19.99/mo

Trains on data

Trains unless you opt out

Free: freeGoogle AI Pro: $19.99/moGoogle AI Ultra: $249.99/mo

Official source

GrokxAI

Real-time answers from X (Twitter) and the live web.

CitationsReal-time webFilesImagesAPI

Model

Grok 4

Platforms

Web · iOS · Android

Paid from

$30.00/mo

Trains on data

Trains unless you opt out

Free: freeSuperGrok: $30.00/mo

Official source

Microsoft CopilotMicrosoft

Footnoted web answers tied into Windows, Edge and Microsoft 365.

CitationsReal-time webFilesImagesAPI

Model

GPT-5 / GPT-4o with Bing search

Platforms

Web · iOS · Android

Paid from

$20.00/mo

Trains on data

Trains unless you opt out

Free: freeCopilot Pro: $20.00/mo

Official source

PerplexityPerplexity AI

Cited research answers, numbered inline sources on every reply.

CitationsReal-time webFilesImagesAPI

Model

In-house Sonar + GPT, Claude, Gemini (Pro model picker)

Platforms

Web · iOS · Android

Paid from

$20.00/mo

Trains on data

Trains unless you opt out

Free: freePro: $20.00/moEnterprise Pro: $40.00/mo

Official source

Price a subscription

Service

Plan

Seats

Whole number, 1–500.

Billing

Monthly (USD)

$20.00

Annual (USD)

$240.00

Monthly (LKR, indicative)

Rs 6,000

Annual (LKR, indicative)

Rs 72,000

Perplexity · Pro · 1 seat · billed monthly. LKR at the indicative Rs 300/USD rate. Save $40.00/yr by switching this plan to annual billing.

How it works

An AI answer engine reads the live web, then writes a single sourced answer instead of handing you ten blue links. This page lines up the 7 engines a Sri Lankan student, freelancer or small-business owner actually has to choose between, Perplexity, ChatGPT Search, Google Gemini (and AI Mode), Microsoft Copilot, Grok, Claude and DeepSeek, across the dimensions that decide which one you pay for.

1. The comparison table

The table is a curated, sourced dataset, not a benchmark and not an opinion score. Each row records seven facts straight from the provider's own pages: the underlying model, what the free tier gives you, the entry paid price, whether answers show citations, whether it reads the live web, file and image upload, public-API availability, supported platforms, and whether the provider trains on your conversations. The filter chips (free tier, shows citations, has API) and the sort control run entirely in your browser; nothing is sent anywhere.

2. The cost calculator

Capabilities tell you which engine; the calculator tells you the bill. It is deterministic, pick a service, a plan, a seat count and a billing period, and it applies the published price:

monthly billing → monthlyUSD = per_seat_price × seats; annualUSD = per_seat_price × 12 × seats

annual billing → annualUSD = annual_plan_price × seats; monthlyUSD = annualUSD ÷ 12

Annual-plan prices store the provider's published yearly figure, so a discounted annual plan (Perplexity Pro and Claude Pro both bill less than 12× monthly) shows up as a real saving. A second arithmetic route, annualSavingsUSD(), recomputes month-to-month-for-a-year minus the annual plan and surfaces the difference as a verifiable “save USD X/yr” note.

3. The LKR column is indicative

USD figures multiply by a fixed CBSL middle rate of Rs 300per USD to produce the rupee columns. This is a constant, not a live feed, your bank's actual rate plus FX margin and card fees will differ by a few percent. For a live USD-to-LKR rate with Wise, Payoneer and Skrill fee comparisons, use the Freelancer USD-LKR calculator in Related tools.

4. Cross-checks

The data module exports verifyWorkedExamples() (which recomputes the worked examples below, including the zero-seat and 501-seat error cases) and verifyDatasetIntegrity() (which asserts unique ids, non-negative prices, an https source on every row, and that each “best for” pick points at a real engine). Both run at typecheck time, so a typo in a price during a quarterly update fails the build instead of shipping silently.

Worked examples

Undergrad on a budget, Perplexity Pro, 1 seat, monthly

A Moratuwa student writing a literature review wants cited answers and more deep searches than the free tier allows.

Inputs: service = Perplexity, plan = Pro, seats = 1, billing = monthly.
Per-seat monthly price = USD 20.00.
monthlyUSD = 20.00 × 1 = USD 20.00.
annualUSD (monthly billing) = 20.00 × 12 × 1 = USD 240.00.
LKR (Rs 300/USD): monthly = 20 × 300 = Rs 6,000; annual = 240 × 300 = Rs 72,000.
Switching to Perplexity Pro's annual plan (USD 200/yr) saves USD 40/yr.

Small team, ChatGPT Plus, 3 seats, annual

A 3-person startup standardises on ChatGPT. Plus has no annual discount, so the annual-per-seat figure is simply 20 × 12 = 240.

Inputs: service = ChatGPT Search, plan = Plus, seats = 3, billing = annual.
Annual price per seat = USD 240.00 (no discount on the individual Plus plan).
annualUSD = 240.00 × 3 = USD 720.00.
monthlyUSD (effective) = 720.00 ÷ 12 = USD 60.00.
LKR (Rs 300/USD): annual = 720 × 300 = Rs 216,000; monthly ≈ Rs 18,000.
Tip: ChatGPT Team (USD 25/seat/mo billed annually) excludes your data from training, often the better team buy.

Edge case, Free tier, any engine, 1 seat

The literature-review student first tries the free plan. Free tiers cost nothing, so every output is zero, no NaN, no surprise.

Inputs: service = Perplexity, plan = Free, seats = 1, billing = monthly.
Per-seat monthly price = USD 0.00.
monthlyUSD = 0 × 1 = USD 0.00; annualUSD = 0 × 12 × 1 = USD 0.00.
LKR: 0 × 300 = Rs 0 for both monthly and annual.
Boundary guard: seats = 0 or seats = 501 returns a clear error, not a silent zero, the calculator only accepts whole numbers 1–500.

Frequently asked questions

Sources & references

Plans, prices, citation behaviour and data-training policies were last cross-checked against the official sources on 2026-06-30. LKR figures are indicative, using a fixed CBSL middle rate of Rs 300 per USD. The dataset is reviewed quarterly and whenever a provider changes a plan.

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Comments & feedback

Spotted a bug or want an improvement? Tell us, our team reviews every comment, and good ideas get built. Comments are public and anonymous.

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Email me at [email protected] , most fixes ship within 24 hours.