Side-by-side comparison · Research & Search
ChatGPT Deep Research vs NotebookLM vs Perplexity (Research)
Everything that matters when choosing between them, in one place: our rating, what each can do, what they cost, and the trade-offs.
Comparing 3 tools, the maximum.
At a glance
ChatGPT Deep Research
3.8Pick it if: ChatGPT users who want a proper write-up on a question and are happy to wait a few minutes for it.
NotebookLM
4.5Pick it if: Anyone who needs to understand or explain a set of documents they don't have time to read properly.
Perplexity (Research)
4.6Pick it if: Anyone who would otherwise spend an afternoon reading tabs to answer one question.
Perplexity (Research) scores highest overall, but NotebookLM gives you more for your money. Which one is right comes down to what you value most.
Overview
| Attribute | ChatGPT Deep Research | NotebookLM | Perplexity (Research) |
|---|---|---|---|
| In one line | ChatGPT's research mode, which browses for you and writes up a cited report. | Upload your own documents and ask questions that only draw on those sources. | Runs dozens of searches on a question and hands back a cited report in minutes. |
| Pricing model | Freemium | Freemium | Freemium |
| Starting price | $8/mo | $4.99/mo | $17/mo |
| Free plan | Yes | Yes | Yes |
| Works with Claude Code | No | No | Yes |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | ChatGPT Deep Research | NotebookLM | Perplexity (Research) |
|---|---|---|---|
| Overall rating | 3.8 | 4.5 | 4.6Winner |
| Ease of useHow quickly someone non-technical gets value from it. | 4.0 | 5.0 | 4.5 |
| FeaturesHow much it can do, and how well the pieces fit together. | 4.0 | 4.5 | 4.5 |
| Output qualityHow good the results are before you fix them. | 4.5 | 4.0 | 4.5 |
| Value for moneyWhat you get for the price, including the free plan. | 3.5 | 5.0 | 4.5 |
| Speed & reliabilityHow fast it is and how often it falls over. | 3.0 | 4.0 | 5.0 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | ChatGPT Deep Research | NotebookLM | Perplexity (Research) |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | Yes |
| Mobile app | Yes | Yes | Yes |
| Desktop app | Yes | No | Yes |
| Browser extension | Yes | Yes | Yes |
| API access | Yes | – | Yes |
| Teams & business | |||
| Team workspace | Yes | Yes | Yes |
| Enterprise plan or SSO | Yes | Yes | Yes |
| Connects to other apps | Yes | Yes | Yes |
| Open source or self-hosted | No | No | No |
| AI abilities | |||
| Works with your files | Yes | Yes | Yes |
| Understands images | Yes | Yes | Yes |
| Makes images | Yes | Yes | Yes |
| Makes video | Yes | Yes | Yes |
| Writes code | Yes | No | Yes |
| Runs agents or automations | Yes | No | Yes |
| Learns your brand or style | Yes | No | No |
| Works in many languages | Yes | Yes | Yes |
| Capabilities score | 16/ 17 | 11/ 17 | 15/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | ChatGPT Deep Research | NotebookLM | Perplexity (Research) |
|---|---|---|---|
| Plans | Free Free Seeing what a report looks like. | FreeOur pick Free Almost everyone. Try this before paying for anything. | Free Free Quick sourced answers and a taste of research mode. |
Go $8/mo Casual users who want more chat, not more research. | Google AI Plus $4.99/mo People who hit the free limits now and then. | ProOur pick $17/mo billed yearly Anyone who researches most days. | |
PlusOur pick $20/mo Anyone who wants deep research weekly. | Google AI Pro $19.99/mo Heavy users who also want Gemini Pro and Deep Research. | Max $200/mo, or $167/mo billed yearly Heavy users who also want the Computer agent and the newest models first. | |
Pro From $100/mo Heavy users who run research daily. | Google AI Ultra From $99.99/mo Power users who want the top of everything Google offers. | Enterprise Pro From $40/seat/mo Teams that need admin controls and shared billing. | |
| Which plan to pick | If you have Plus already, you are set; its deep research allowance covers most people. Do not buy ChatGPT just for research unless you also want the rest of it, because Perplexity Pro costs less and is faster. Pro is only worth it if you run reports every day. | Stay on Free until it stops you doing something. If that happens, Google AI Pro is the sensible step because it also upgrades Gemini and Deep Research, which you will probably want anyway. AI Plus is a cheap middle step if NotebookLM is all you care about. | Pro is the one. The free plan is too tight to judge research mode properly, and Max only makes sense if you want the Computer agent or you hit Pro limits every day. Businesses with a few people on it should look at Enterprise Pro for the admin controls. |
Key features
| Attribute | ChatGPT Deep Research | NotebookLM | Perplexity (Research) |
|---|---|---|---|
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Pros and cons
| Attribute | ChatGPT Deep Research | NotebookLM | Perplexity (Research) |
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Who each one is for
| Attribute | ChatGPT Deep Research | NotebookLM | Perplexity (Research) |
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How we compare
Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability. The "Visit" buttons may use affiliate links, which never affect a score.
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