Which AI is best for research?

ChatGPT, Claude, Gemini and Perplexity all have a research mode that reads many sources and writes a cited report. Pick by which sources you need.

Picks: 7; ranked

The best AI for research is the one whose research mode can reach your sources: ChatGPT, Claude, Gemini and Perplexity all write cited reports. Gemini adds your Gmail, Drive and NotebookLM notebooks, ChatGPT can stick to sites you choose, Claude also searches your connected apps, and Perplexity is the fastest.

Good for

Students and academics doing a literature scan
Analysts writing market or competitor reports
Journalists and writers checking facts with sources
Anyone who wants research that also reads their own files and email

The short answer

Use the research mode in the assistant you already pay for. Choose Gemini for Gmail, Drive and NotebookLM sources, ChatGPT to limit research to sites you trust, Claude to include your connected apps, and Perplexity for speed.

There is no single winner: all four write cited reports, so the deciding factor is which sources each can reach. The main limit is accuracy, since any mode can misread a source, so check the citations you will repeat.

Best for

Cited web reports on a deadline
Research that must include your own files or email
Literature scans with Zotero or arXiv added

Skip it if

You need every claim verified without reading the sources
You cannot send your files or email to an AI provider
You need systematic reviews with screening; use a dedicated academic tool

Research the web and your own apps with Claude

Claude

1
Turn on Research
Click + at the bottom left of the chat and choose Research. A blue indicator shows it is on; click it again to turn it off.
2
Turn on the connectors it should search
Click +, hover Connectors and toggle on the apps you want, such as Google Drive or Gmail. Use Claude on the web or Claude Desktop; on mobile, Research only searches the web.

Ask, naming the sources

Tell Claude which internal sources to pull from as well as the web.

Prompt

Research what our customers have said about onboarding in the last 6 months. Pull relevant context from my Gmail and the Google Docs in our 'Customer interviews' folder, then compare it with what competitors publish about their onboarding. Cite each point.

4
Add papers with a plug (optional)
For academic work in Claude Desktop, add Zotero MCP to search and cite your library, or the arXiv server to fetch papers. Install each from its page.
Uses Zotero MCP, arXiv MCP Server
5
Check the cited sources
Claude runs connector tools during Research without asking each time, so review what it opened. Research uses your usage limits faster than normal chats.

Run Gemini Deep Research on your Gmail, Drive and notebooks

Gemini

1
Start Deep Research
Go to gemini.google.com, click Add Files, then Deep Research.
2
Pick sources
Click Sources to add Gmail or Drive (the Google Workspace app must be connected first). Deselect Google Search to research only your own sources. You can also upload files or add NotebookLM notebooks.

Ask and edit the plan

Gemini writes a research plan. Click Edit plan to change it before you start.

Prompt

Using my Drive files and Gmail from 2026, summarize every vendor quote we received for office furniture, with price, delivery time and contact, then recommend the best two.

4
Open the report
It usually takes 5 to 10 minutes. You can leave the chat; Gemini notifies you, then click Open to read the report.

Write a cited report with ChatGPT deep research

ChatGPT

1
Turn on deep research
In a new chat, click + in the prompt box and pick Deep research, or type /Deepresearch. The usage counter shows how many tasks your plan has left.
2
Choose sources
Attach files if the report should use them. To stay on trusted sites, open Sites > Manage sites, add the domains, and choose either only those sites or Prioritize these sites, but allow full-web search.

Ask a scoped question

Say the question, who the report is for, the time range and the format you want back.

Prompt

Research how US states regulated short-term rentals between 2023 and 2026. Compare the 10 largest markets in a table: rule, year, enforcement, effect on listings. Cite primary sources (city or state sites) where possible.

4
Edit the research plan
ChatGPT may ask clarifying questions and then shows a plan. Change it before it starts, and interrupt while it runs if it drifts.
5
Check and export
Open the report's sources used section and click the citations behind the claims you will repeat. Download it as Markdown, Word or PDF.
Tip: Ask a follow-up like "List every claim in this report that rests on a single source" to find weak spots.

Get a fast cited report in Perplexity

Perplexity

1
Choose Research mode
In the search box, open the mode selector and pick Research. It works on the web, mobile and Mac apps.

Ask your question

Most reports finish in under 3 minutes after dozens of searches.

Prompt

What does current evidence say about four-day work weeks and productivity? Separate peer-reviewed studies from company pilots and cite each.

3
Export or share
Export the report to PDF or a document, or turn it into a Perplexity Page to share.
4
Use it from other assistants (optional)
The official Perplexity MCP server brings the same cited search and research into Claude, Cursor or VS Code. It bills a Perplexity API account.
Uses Perplexity MCP Server

Best plugs for this

Plugs that add web or paper sources to an assistant, ranked by official status, then whether we hold a reviewed page, then GitHub stars.

Questions

Which AI is best for research?

The one whose research mode reaches your sources. ChatGPT, Claude, Gemini and Perplexity all write cited reports; Gemini adds Gmail, Drive and NotebookLM, ChatGPT can stick to sites you pick, Claude searches your connected apps, and Perplexity is fastest.

Which ChatGPT is good for research?

Use deep research, from the + menu or by typing /Deepresearch. It reads many sources, follows a plan you can edit, and returns a report with citations you can export to Word or PDF. How many tasks you get depends on your plan.

Is there a free AI for research?

Perplexity gives Free users limited access to its Research mode. ChatGPT deep research and Gemini Deep Research availability depends on your plan and country, so check the counter or tools menu in your account.

Does Claude have deep research?

Yes. Turn on Research from the + menu. It runs many searches that build on each other and can also search Gmail, Google Calendar, Google Docs and other connectors you turn on, on the web and desktop apps.

How long does AI deep research take?

Perplexity finishes most tasks in under 3 minutes. Gemini usually takes 5 to 10 minutes. ChatGPT shows progress as it runs and you can interrupt it.

Can AI research tools read my own files?

Yes. ChatGPT deep research uses uploaded files and connected apps such as Google Drive, Gemini can add Gmail, Drive, uploads and NotebookLM notebooks, and Claude Research uses the connectors you turn on.

Which AI is best for research papers?

Add a paper source to your assistant: Zotero MCP searches and cites your own library, and the arXiv and PubMed servers fetch papers. For a full systematic review with screening, dedicated academic tools are still the better fit.

Can I trust the citations?

Check them. Every mode links its sources, but it can still misread or overstate one. Open the sources behind any claim you will repeat.

Can I limit research to specific websites?

In ChatGPT, yes: Sites > Manage sites lets you research only those domains or prioritize them. In Gemini you can deselect Google Search to use only your own sources.

Sources

Docs, issue trackers and discussions this page is built from.

Show all 13

Deep research in ChatGPT · help.openai.com
Use research on Claude · support.claude.com
Use Deep Research in Gemini Apps · support.google.com
What is Research mode? · perplexity.ai
Use connectors to extend Claude's capabilities · support.claude.com
GitHub · github.com
GitHub · github.com
GitHub · github.com
GitHub · github.com
GitHub · github.com
GitHub · github.com
GitHub · github.com
Firecrawl pricing · firecrawl.dev