Best software · AI tools
9 Best AI Research Assistants of 2026
This list is for analysts, consultants, researchers and other knowledge workers who need answers they can trace back to a source and summaries of long documents. It mixes general assistants with research modes (Perplexity, ChatGPT, Claude, Gemini), a notebook that works only from your own files (Gemini Notebook) and specialist tools for academic papers (Elicit, Consensus, Scite, Undermind). We compared documented features and published US prices; scores weight features 40%, ease of use 30% and value 30%.
By the Mojolin research desk · Updated November 9, 2026 · 9 tools compared · Prices checked on vendor pages, latest November 9, 2026
Questions or corrections: editorial@mojolin.com
Mojolin is self-funded How we score
Perplexity is the best starting point for most analysts: every answer carries inline citations, and Pro at $17 per month billed annually adds deep research and premium data from PitchBook, Statista and S&P Capital IQ. ChatGPT Deep Research is the stronger choice for long, structured reports where you want to approve sources and steer the plan, and Claude is best for reading and summarizing very long documents. Gemini is the best value for Google Workspace users, and Gemini Notebook is the best free tool for questioning your own files. For academic literature, Elicit leads for systematic reviews, Scite for checking how findings were cited and Undermind for thorough technical searches.
Top picks
Best overall
Perplexity
9.1 / 10
Analysts who want fast, cited answers to market, company and news questions without writing a long prompt.
Read the review →Runner-up
ChatGPT Deep Research
9.0 / 10
Knowledge workers who want report-length research built from approved sources and private files.
Read the review →Also great
Claude
8.9 / 10
Analysts who work with long documents and want careful summaries and written analysis.
Read the review →Comparison table
| # | Tool | Pricing | Score | |
|---|---|---|---|---|
| 1 | Perplexity | Analysts who want fast, cited answers to market, company and news questions without writing a long prompt. | Free plan; Pro $17 per month billed annually; Max $167 per month billed annually; Enterprise plans available | 9.1 |
| 2 | ChatGPT Deep Research | Knowledge workers who want report-length research built from approved sources and private files. | Free plan with limited deep research; Go $8 per month (limited deep research); Plus $20 per month (expanded); Pro from $100 per month | 9.0 |
| 3 | Claude | Analysts who work with long documents and want careful summaries and written analysis. | Free plan; Pro $17 per month billed annually ($200 up front) or $20 monthly; Max $100 and Ultra $200 per month; Team $20 per seat per month billed annually | 8.9 |
| 4 |  Google Gemini Deep Research | Google Workspace users who want research reports and AI help inside Gmail and Docs. | Free plan includes Deep Research; Google AI Plus $4.99 per month; Google AI Pro $19.99 per month; Google AI Ultra from $99.99 per month | 8.8 |
| 5 |  Gemini Notebook (formerly NotebookLM) | Knowledge workers who need summaries and cited answers from their own document sets. | Free; higher limits through Google AI Plus at $4.99 per month, Google AI Pro at $19.99 per month and Ultra | 8.7 |
| 6 |  Elicit | Researchers and evidence teams who need to search, screen and extract data from scientific papers. | Free Basic plan; Plus $11 per user per month billed annually ($132 a year); Pro and Scale tiers higher; Enterprise custom | 8.4 |
| 7 |  Consensus | Clinicians, students and analysts who want quick answers backed by published studies. | Free plan; Pro and Deep plans, monthly or annual (see vendor pricing, USD check pending) | 8.3 |
| 8 |  Scite | Researchers who need to check whether a finding has been supported or contested by later studies. | 7-day free trial; Basic $12 per month billed yearly; Pro $40 per month billed yearly; Enterprise custom | 8.2 |
| 9 |  Undermind | Scientists and R&D teams who need a thorough literature search on a specific technical question. | Free plan; Pro $16 per month billed annually; Team $15 per person per month billed annually; Enterprise custom | 8.1 |
Scoring weights
Every tool gets three editorial scores out of 10, from vendor documentation, product pages and the published price. The overall score is the weighted average below, the same method on every list. Full method
The full ranking
Rank 1 · Best overall
Perplexity
An answer engine that searches the web, files and connected apps and cites a source for every claim.
perplexity.ai9.1
out of 10
Best for: Analysts who want fast, cited answers to market, company and news questions without writing a long prompt.
Perplexity is built around the one thing research users care about most: showing where an answer came from. Every response carries inline citations that link to the source of each claim, and that holds on the free plan too. Pro, at $17 per month billed annually, adds deep research, a choice of models from OpenAI, Google, Anthropic and NVIDIA, search across files and connected apps, and Perplexity Computer for longer tasks. For analysts, the standout addition is premium data: Pro and Max can draw on PitchBook, Statista and S&P Capital IQ, which general chatbots do not offer out of the box.
The trade-offs are limits and price at the top end. The free tier uses basic models with limited weekly usage, and Max costs $167 per month billed annually for heavy, sustained work. Like any search-based tool, answer quality depends on what it can find, so specialist questions still deserve a second look at the cited pages.
Standout feature
Every answer cites its sources inline, and paid plans add PitchBook, Statista and S&P Capital IQ data.
Use cases
Equity and market analysts
Pull a company overview with PitchBook and S&P Capital IQ data
Outcome: A cited brief to check before a call
Consultants
Answer a client question across web sources and uploaded files
Outcome: Sourced answers in one thread
Journalists and comms teams
Check a claim against recent coverage
Outcome: Links to the original reporting
Key features
- Inline citations in every answer, on every plan
- Deep research on Pro, with higher limits on Max
- Premium data sources such as PitchBook, Statista and S&P Capital IQ on Pro and Max
- Search across the web, uploaded files and connected apps
- Choice of models from OpenAI, Google, Anthropic and NVIDIA, plus Model Council
Pros
- Citations are shown inline, so every claim can be checked
- Pro adds finance and market data that general chatbots lack
- Free plan is useful for quick lookups
Cons
- Free plan uses basic models with limited weekly usage
- Max costs $167 per month billed annually
- Answers are only as good as the sources it finds, so niche topics still need checking
Rank 2 · Runner-up
ChatGPT Deep Research
OpenAI's research mode in ChatGPT, which plans a multi-step investigation and returns a long, sourced report.
chatgpt.com9.0
out of 10
Best for: Knowledge workers who want report-length research built from approved sources and private files.
Deep research is the part of ChatGPT that turns it from a chatbot into a research assistant. You pick deep research from the composer, describe the question and get a proposed plan you can refine before it runs. You can curate a list of approved URLs, connect trusted industry sources and add private files, and ChatGPT gives those priority over general web results. While it works you can follow how it weighs sources, and you can interrupt or redirect it. The finished report can be shared or downloaded as PDF or DOCX.
Access depends on the plan. Free and Go at $8 per month get limited deep research, Plus at $20 per month gets an expanded allowance, and Pro, from $100 per month, gets the maximum. The Go plan may include ads. For one-off questions a search tool is faster, but for a structured market or literature brief this is one of the most capable options available.
Standout feature
You can approve the sources and edit the research plan before ChatGPT starts writing.
Use cases
Market researchers
Compare two markets using a set of approved industry sources
Outcome: A structured report with sources
Strategy teams
Combine internal files with public research on a competitor
Outcome: One brief instead of scattered notes
Policy analysts
Review and steer the research plan before it runs
Outcome: A report scoped to the actual question
Key features
- Curate approved URLs and trusted industry sources that take priority over general web results
- Add private files or enterprise data to a research task
- Review and edit the proposed research plan, or interrupt and redirect it
- Follow how sources are evaluated while the report is assembled
- Download finished reports as PDF or DOCX
Pros
- You control the sources and can redirect the plan mid-run
- Reports export to PDF and DOCX for sharing
- Included in the same subscription as the rest of ChatGPT
Cons
- Free and Go plans only get limited deep research
- Go plan may include ads
- Long reports take time and still need fact checking against the cited pages
Rank 3 · Also great
Claude
Anthropic's AI assistant, with web search on every plan and a Research mode on paid plans.
claude.com8.9
out of 10
Best for: Analysts who work with long documents and want careful summaries and written analysis.
Claude is a strong fit for research that starts with documents rather than with a web search. Its context window reaches up to 1M tokens depending on the model, so it can take in long reports, filings or transcripts and summarize or compare them in one pass. Web search is available on every plan, including Free, and paid plans add a Research mode that runs a deeper, multi-step investigation. Projects keep related files and chats together, connected apps bring in your own tools, and Pro adds Claude in Chrome and Microsoft 365.
Pro costs $17 per month with annual billing, paid as $200 up front, or $20 monthly. Usage limits reset every five hours and every week, which heavy researchers will notice, and Max at $100 per month offers five times the Pro usage. Teams can choose the Team plan at $20 per seat per month billed annually, which adds enterprise search across company data.
Standout feature
A context window of up to 1M tokens lets it read very long documents in a single pass.
Use cases
Financial analysts
Summarize and compare several long filings
Outcome: Side-by-side findings in one chat
Legal and compliance staff
Pull key obligations from a long policy document
Outcome: A clear summary with the relevant passages
Research leads
Run Research mode on an open question
Outcome: A multi-step answer with sources
Key features
- Web search on every plan, including Free
- Research mode on Pro, Max, Ultra, Team and Enterprise
- Context window of up to 1M tokens, depending on model
- Projects to group documents and chats, up to 5 on Free
- Connected apps plus Claude in Chrome and Microsoft 365 on Pro
Pros
- Free plan includes web search, file creation and code execution
- Long context suits large reports and document sets
- Team plan adds enterprise search across your organization
Cons
- Research mode is not included on the Free plan
- Usage limits reset every 5 hours and every week
- Heavy users may need Max at $100 per month
Rank 4
Google Gemini Deep Research
Google's Gemini assistant, whose Deep Research feature analyzes hundreds of sources into a full report.
gemini.google8.8
out of 10
Best for: Google Workspace users who want research reports and AI help inside Gmail and Docs.
Gemini's Deep Research feature is designed for the long-form question: Google says it can analyze hundreds of sources in real time and turn them into a comprehensive report, from competitor deep dives to topic overviews. Unusually, Deep Research appears on the free plan, which runs on the Flash-Lite model, so anyone can try it before paying.
Paid tiers raise usage and add Google's integrations. Google AI Plus costs $4.99 per month with double the free usage, Gemini in Gmail and other Google apps, Gemini Notebook and 400 GB of storage. Google AI Pro at $19.99 per month adds the Pro model, four times the free usage, a 1M token context window and 5 TB of storage. Ultra starts at $99.99 per month. The value is best for people already living in Gmail, Docs and Drive; if your work happens elsewhere, the bundle is less of a draw.
Standout feature
Deep Research is included even on the free Gemini plan.
Use cases
Product managers
Run Deep Research on a competitor
Outcome: A long report to share in Docs
Small business owners
Research suppliers or regulations on the free plan
Outcome: A sourced overview at no cost
Workspace teams
Use Gemini in Gmail and Docs alongside research
Outcome: Research and drafting in the same apps
Key features
- Deep Research that analyzes hundreds of sources to build a report
- Deep Research included on the free plan
- 1M token context window on Google AI Pro
- Gemini in Gmail, Docs and other Google apps on paid plans
- Gemini Notebook included, with higher limits on paid plans
Pros
- Deep Research is available without paying
- Google AI Plus starts at $4.99 per month
- Paid plans bundle cloud storage and Gemini Notebook
Cons
- Free plan uses the Flash-Lite model
- Best value assumes you already use Google apps
- Ultra starts at $99.99 per month
Rank 5
Gemini Notebook (formerly NotebookLM)
Google's source-grounded research notebook that answers only from the documents, sites and videos you add.
notebook.google8.7
out of 10
Best for: Knowledge workers who need summaries and cited answers from their own document sets.
Gemini Notebook, the product Google previously called NotebookLM, takes the opposite approach to a web search tool: it works from the sources you give it. You can add PDFs, websites, YouTube videos, audio files, Google Docs, Slides and Sheets, Word and PowerPoint files, and then chat with the notebook. Answers come with inline citations back to those sources, which makes it a reliable way to summarize a stack of reports or interview notes without the model wandering off. It can also turn material into study guides, briefings, Audio Overviews, Video Overviews, slide decks and mind maps.
The free plan is generous, with 100 notebooks and 50 sources per notebook, each source up to 500,000 words or 200 MB. Google AI Plus at $4.99 per month raises that to 200 notebooks and 100 sources, and Pro to 500 notebooks and 300 sources. Its limit is scope: it is for understanding material you already have, not for finding new sources.
Standout feature
Answers come only from the sources you add, with inline citations back to each one.
Use cases
Analysts
Load a set of reports and ask comparison questions
Outcome: Answers cited to specific documents
Managers
Turn a long briefing pack into an Audio Overview
Outcome: A summary to listen to between meetings
Researchers
Organize interview transcripts and notes in one notebook
Outcome: Searchable, cited findings
Key features
- Answers grounded in your sources with inline citations
- Sources include PDFs, websites, YouTube videos, audio, Google Docs, Slides and Sheets
- Up to 50 sources per notebook on Free, up to 300 on Pro
- Study guides, briefings, Audio Overviews, Video Overviews and mind maps
- Supports 80+ languages
Pros
- Free plan allows 100 notebooks and 50 sources each
- Answers stay tied to the sources you uploaded
- Turns dense material into briefings and audio summaries
Cons
- It does not search the open web the way an answer engine does
- Each source is capped at 500,000 words or 200 MB
- Advanced sharing needs a paid plan
Rank 6
Elicit
An AI research assistant for academic papers, with search, summaries, data extraction and systematic reviews.
elicit.com8.4
out of 10
Best for: Researchers and evidence teams who need to search, screen and extract data from scientific papers.
Elicit is aimed at people whose sources are academic papers. The free Basic plan already offers unlimited search across more than 138 million papers, unlimited summaries, chat with full-text papers, visible sources for answers and Zotero import, plus limited use of the Research Agent and Research Reports. Plus, at $11 per user per month billed annually, adds exports to RIS, CSV, BIB, PDF and DOCX, search across more than 500 thousand clinical trials, extraction tables with five columns at a time and standard Research Agent usage.
The higher tiers are where Elicit separates itself from general assistants. Pro adds a dedicated Systematic Review Workflow that can screen 5,000 papers, reports that extract from up to 135 data sources and API access, and Enterprise reaches 40,000 papers with no training on your data by default. It is less useful for market or news research, but for evidence reviews it is one of the most specialized options.
Standout feature
A dedicated systematic review workflow that can screen 5,000 papers on Pro.
Use cases
Health economists
Search and summarize studies on a treatment
Outcome: A table of findings with sources
Evidence review teams
Screen thousands of papers for a systematic review
Outcome: A shortlist ready for full-text review
R&D analysts
Extract study details into columns
Outcome: Structured data for comparison
Key features
- Search across more than 138 million papers
- Unlimited summaries and chat with papers on the free plan
- Search across more than 500 thousand clinical trials on Plus
- Systematic Review Workflow that can screen 5,000 papers on Pro
- Research Agent and Research Reports, plus Zotero import
Pros
- Free plan includes unlimited search and summaries
- Built for systematic reviews and data extraction
- Exports to RIS, CSV, BIB, PDF and DOCX on Plus
Cons
- Focused on academic literature rather than business or news sources
- Systematic review features start on the Pro tier
- Table extraction is limited by columns per plan
Rank 7
Consensus
An AI search engine that answers questions from peer-reviewed research papers.
consensus.app8.3
out of 10
Best for: Clinicians, students and analysts who want quick answers backed by published studies.
Consensus is a search engine that answers questions from scientific literature rather than from the general web. You ask a research question and it draws on peer-reviewed papers, which makes it useful for clinicians, students and analysts who need to know what the published evidence says. Its Deep Review feature runs a broader literature review across many papers, search filters help narrow results, and there is an API for teams that want to build on its index. Consensus says more than 5 million researchers, students and clinicians use it.
There is a free plan, and paid individual plans come in Pro and Deep tiers with monthly or annual billing, plus Team and Enterprise options. Its pricing page loads plan prices with JavaScript, so we could not confirm a USD price from this location and have marked pricing as pending. Like Elicit, it is a specialist: excellent for evidence questions, much less useful for market or company research.
Standout feature
Answers come from peer-reviewed papers rather than general web pages.
Use cases
Clinicians
Check what studies say about a treatment
Outcome: An answer backed by published papers
Students
Find papers for a thesis question
Outcome: A starting reading list
Health and science writers
Verify a claim against research
Outcome: Sources to cite
Key features
- Answers drawn from peer-reviewed research papers
- Deep Review for literature reviews across many papers
- Search filters for narrowing results
- Individual, Team and Enterprise plans
- API for developers
Pros
- Focused on published research rather than the open web
- Free plan to try before paying
- Monthly and annual billing options
Cons
- Pricing page loads plans with JavaScript, so we could not confirm USD prices here
- Limited use for business, market or news questions
- Deep Review volume depends on the plan
Rank 8
Scite
A research platform whose Smart Citations show how papers have been cited by later work.
scite.ai8.2
out of 10
Best for: Researchers who need to check whether a finding has been supported or contested by later studies.
Scite answers a question most research tools skip: what did later papers say about this one? Its Smart Citations draw on more than 1.6 billion citations across more than 300 million scholarly sources, so you can see the context in which a study was cited rather than just a count. On top of that sit a research-grounded AI Assistant, full-text citation search, collections with citation alerts and dashboards, a Zotero plugin and a browser extension that shows citation badges on other sites.
Basic costs $12 per month billed yearly and includes the full Assistant and Search, Smart Citation reports, collections up to 1,000 papers and 250 MCP credits a month. Pro at $40 per month billed yearly adds API access, 2,500 MCP credits, collections up to 10,000 papers and patent, clinical trial and grant datasets. There is no permanent free plan, only a 7-day trial, and the tool is clearly built for academic rather than business research.
Standout feature
Smart Citations show whether later research supported or contested a paper.
Use cases
Scientists
Check whether a key study has been supported or contested
Outcome: Citation context before relying on it
Regulatory and medical affairs teams
Monitor citations of important papers
Outcome: Alerts when new work cites them
Librarians
Help researchers assess sources
Outcome: Clearer evidence quality checks
Key features
- Smart Citation reports for articles, drawn from 1.6B+ citations
- Search across 300M+ scholarly sources
- AI Assistant grounded in research
- Collections with citation alerts and dashboards
- Zotero plugin, browser extension, MCP and API access
Pros
- Shows the context in which a paper was cited
- Basic plan includes the full Assistant and Search
- Pro adds patent, clinical trial and grant datasets
Cons
- No permanent free plan, only a 7-day trial
- API access requires Pro at $40 per month billed yearly
- Academic focus limits use for business research
Rank 9
Undermind
A deep search agent for scientific literature that spends minutes reading papers to find the relevant ones.
undermind.ai8.1
out of 10
Best for: Scientists and R&D teams who need a thorough literature search on a specific technical question.
Undermind takes a slower, more thorough approach to literature search. Instead of returning results instantly, its search agent spends a few minutes working through papers to find the ones that match a specific technical question, then lets you chat about the results and build reports. It was started by two quantum physics PhDs from MIT and is backed by Y Combinator, and it is clearly built for scientists and R&D teams rather than general business users.
The free plan includes deep searches, reports, shared workspaces and the ability to connect your own agents such as Claude and ChatGPT, with standard rate limits. Pro, at $16 per month billed annually, adds the latest models, deeper analysis of full texts, ten times higher usage limits and unlimited workspaces, files and paper libraries. Team is $15 per person per month billed annually with centralized billing. Enterprise customers get custom security terms, and Undermind says company data is never used to train AI models.
Standout feature
It spends minutes reading papers to find the relevant ones, rather than returning instant keyword matches.
Use cases
R&D scientists
Search for prior work on a narrow technical question
Outcome: A focused list of relevant papers
Patent and IP teams
Survey the published literature on a method
Outcome: A report to review with counsel
Research groups
Share searches in a common workspace
Outcome: One library for the whole team
Key features
- Deep searches and reports on scientific literature
- Chat with strong AI models about results
- Shared workspaces for collaboration
- Connect your own agents, such as Claude and ChatGPT
- Deeper full-text analysis and 10x higher limits on Pro
Pros
- Free plan includes deep searches and reports
- Pro adds unlimited workspaces, files and paper libraries
- Enterprise data is never used to train AI models, per Undermind
Cons
- Searches take a few minutes to complete
- Built for scientific papers rather than web or business sources
- Team admin features need the Team plan
Frequently asked questions
+What is the best AI research assistant in 2026?
Perplexity is our top pick for analysts because every answer cites its sources inline and Pro, at $17 per month billed annually, adds deep research and premium data from PitchBook, Statista and S&P Capital IQ. ChatGPT Deep Research is the best alternative for long, structured reports.
+Which AI research assistant is free?
Perplexity, ChatGPT, Claude, Gemini, Gemini Notebook, Elicit, Consensus and Undermind all have free plans. Gemini includes Deep Research on its free plan, and Gemini Notebook allows 100 notebooks with 50 sources each for free.
+Which tool is best for summarizing my own documents?
Gemini Notebook is built for this: it answers only from the files, sites and videos you add, with inline citations. Claude is a strong paid option for very long documents, with a context window of up to 1M tokens depending on the model.
+What is the best AI tool for academic papers?
Elicit is best for literature reviews and data extraction, searching more than 138 million papers. Scite is best for checking how a paper was cited by later research, and Undermind for thorough searches on narrow technical questions.
+Is NotebookLM still available?
Yes. Google now calls it Gemini Notebook, and it still works from the sources you upload. It is free, with higher limits through Google AI Plus, Pro and Ultra.
+Can I trust the citations from AI research tools?
Citations make answers checkable, not automatically correct. Open the cited page and confirm the figure or quote before you use it, especially for numbers, recent events and niche topics.
About this list
Updated November 9, 2026 by the Mojolin research desk. Mojolin is self-funded
Questions or corrections: editorial@mojolin.com
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