# Gemini Notebook (formerly NotebookLM) vs Claude Projects
> NotebookLM vs Claude Projects: a Gemini notebook holds up to 600 sources and cites every answer, while Claude Projects give Claude your files. See which wins.
By Juli · Published Oct 26, 2026 · https://www.kortex-notebooklm.com/blog/gemini-notebook-vs-claude-projects
Both tools let you upload a stack of documents and talk to them, so which one deserves your files? They were built for different jobs. **Gemini Notebook** is a research tool that answers only from your sources and shows where each claim came from. **Claude Projects** is a workspace that gives Claude your files as background while it writes, codes and reasons. Here's how they compare, and how to use both.
> **Key Takeaways**
> - Gemini Notebook grounds every answer in your sources with inline citations.
> - Claude Projects give Claude your files as context, alongside its own knowledge.
> - Free tiers: 100 Gemini notebooks versus 5 Claude projects ([Claude Help Center](https://support.claude.com/en/articles/9517075-what-are-projects), 2026).
> - Cited research suits Gemini Notebook; drafting and code suit Claude.
## How do Gemini Notebook and Claude Projects differ?
The difference is where answers may come from. Gemini Notebook answers from the sources in your notebook, and Google's help puts it plainly: chat responses "only use data from your sources" ([Gemini Notebook Help](https://support.google.com/gemininotebook/answer/16179559?hl=en), 2026). A Claude Project, by contrast, is a self-contained workspace with its own chat history and knowledge base (Claude Help Center, 2026). Claude then adds its own reasoning on top. In other words, one is closed-book and the other is open-book. Closed-book means Gemini Notebook attaches citations that jump to the passage it used, and when an answer isn't in your sources, it says so instead of filling the gap. Open-book means Claude reads your files, then brings everything else it knows. As a result, it's better at producing something new, such as a draft, a refactor or an argument. For a step-by-step setup, see [how to use Claude Projects with Gemini Notebook](/blog/claude-projects-research).
A notebook has a few agentic actions, too. It can search the web, run code or create files on your behalf when you ask, though Google calls these functions experimental. That grounding discipline is also the heart of our [Gemini Notebook vs ChatGPT comparison](/blog/notebooklm-vs-chatgpt).
Is one of them smarter? Not really. One is a careful librarian, the other a capable collaborator.
## How many files can each one hold?
A Gemini notebook holds 50 sources on the free tier and up to 600 on Ultra ([Gemini Notebook Help](https://support.google.com/gemininotebook/answer/16213268?hl=en), 2026), with up to 500,000 words per source ([Gemini Notebook Help](https://support.google.com/gemininotebook/answer/16269187?hl=en), 2026). Claude, on the other hand, counts tokens. Its chat context is 200K tokens on most models, about 500 pages, and reaches 1M tokens on its newest models on paid plans ([Claude Help Center](https://support.claude.com/en/articles/8606394-how-large-is-the-context-window-on-paid-claude-plans), 2026). Notably, a project's knowledge shares that window. On paid plans, Claude switches to retrieval once a project nears the limit, so it can store up to 10 times more content, and a visual indicator tells you when that happens. Free users, however, get neither the extra room nor many containers. A free Claude account can create five projects, while a free Gemini Notebook account gets 100 notebooks.
| Capacity | Gemini Notebook | Claude Projects |
|---|---|---|
| Containers | 100 notebooks free, 500 on Pro and Ultra | 5 projects free, no stated limit on paid plans |
| Material per container | 50 sources free, 100 Plus, 300 Pro, up to 600 Ultra | Project knowledge shares the context window |
| Size per item | Up to 500,000 words or 200MB per source | Counted in tokens, not per file |
| When it fills up | Start another notebook | Paid plans switch to retrieval (RAG), up to 10x more content |
Sources: Gemini Notebook Help, 2026; [Claude Help Center](https://support.claude.com/en/articles/11473015-retrieval-augmented-generation-rag-for-projects), 2026.
## Is Gemini Notebook more accurate than Claude?
For fact-checking, Gemini Notebook has the edge. In a 2025 study accepted to the Computation + Journalism Symposium, NotebookLM hallucinated in 13% of outputs on a 300-document corpus, versus about 40% for ChatGPT and Gemini chat ([Hagar, Agustianto & Diakopoulos](https://arxiv.org/abs/2509.25498), 2025). Claude wasn't in that test. Nevertheless, the lesson carries over, because grounding narrows the room for error. In fact, most mistakes in the study weren't invented facts. The authors found models that "added unsupported characterizations of sources" instead. Claude will quote and reference your project files when you ask, and it's excellent at reasoning across them. However, it's also free to draw on what it already knows. That's a strength when you want ideas and structure. On the other hand, it's a risk when you need to prove a sentence came from page 14 of a specific report. Using Claude for sourced work? Ask for verbatim quotes, then check them.
Or skip the checking step: let Claude ask your notebook and bring back Gemini Notebook's own citations. Our guide to [getting cited notebook answers in Claude](/blog/gemini-notebook-in-claude) shows how that works.
Claude's writing, Gemini Notebook's citations
Kortex MCP lets Claude ask any of your notebooks and get the answer back with its sources, then draft from it in the same chat. It's included with Kortex Pro and Lifetime.
Get Kortex MCP with ProGet Kortex free on Chrome
## What can each one make from your files?
Gemini Notebook's Studio turns sources into ready-made formats, while Claude Projects make whatever you ask for, under instructions that stay fixed across every chat. The Studio covers Audio Overviews, Video Overviews, Mind Maps, Reports, Flashcards, Quizzes, Infographics and Slide Decks. In addition, quizzes include short-answer and fill-in-the-blank questions, and Video Overviews come in a roughly 60-second Short format ([Google Workspace Updates](https://workspaceupdates.googleblog.com/2026/09/new-back-to-school-features-and-learning-tools-available-in-Gemini-Notebook.html), 2026). Claude, meanwhile, handles long-form writing, code, data analysis and artifacts such as documents or small interactive apps. So the real trade is polished formats in one click versus custom work shaped to your prompt. That said, you can also have both. Our guide to [making Audio Overviews and flashcards from Claude](/blog/gemini-notebook-studio-from-chat) shows Claude asking the Studio for them.
## What do they cost, and can you share them?
Both start free, but the free tiers differ in scale: 100 notebooks on Gemini Notebook against five projects on Claude (Claude Help Center, 2026). On paid plans, Claude removes the project cap and adds retrieval. Google, meanwhile, raises Gemini Notebook's limits through its AI Plus, Pro and Ultra plans. Those limits refresh every five hours until a weekly cap, with Plus at twice the standard allowance and Pro at four times ([Gemini Notebook Help](https://support.google.com/gemininotebook/answer/17670842?hl=en), 2026). Sharing works differently, too. Gemini Notebook lets you share a notebook with specific people or publicly by link. Claude, in contrast, shares projects only on Team and Enterprise plans, with "Can view" and "Can edit" permissions (Claude Help Center, 2026). Our guides to [whether Gemini Notebook is free](/blog/is-notebooklm-free) and to its [usage limits](/blog/gemini-notebook-usage-limits) cover Google's plans in detail.
## Is Gemini Notebook or Claude better for research and studying?
Pick by the job, not the brand. If you need to prove where a sentence came from, the 13% versus 40% error gap in grounded testing favours Gemini Notebook (Hagar, Agustianto & Diakopoulos, 2025). If you need new writing or code, in contrast, Claude's open-book reasoning fits better. People ask this split in several forms. For example, when we analyzed 1,451 Google autocomplete suggestions for these topics in October 2026, "notebooklm vs claude" came back with "for studying", "for research" and "claude code" variants. Here's a quick guide.
| If you mainly... | Choose |
|---|---|
| Read papers, contracts or course material and need citations | Gemini Notebook |
| Want audio or video summaries to review on the go | Gemini Notebook |
| Make flashcards, quizzes and study guides from readings | Gemini Notebook |
| Draft long documents in a consistent voice | Claude Projects |
| Write or review code against a codebase or spec | Claude Projects |
| Need both cited facts and polished writing | Both, connected |
## How does Kortex connect Claude to Gemini Notebook?
Google publishes no public API for Gemini Notebook, so Claude can't reach your notebooks on its own. **Kortex MCP** is the bridge we built for that job. It gives Claude, ChatGPT, Cursor, VS Code and other MCP clients 145+ notebook tools ([Kortex MCP docs](/docs/mcp-server), 2026). It comes with Kortex Pro and Lifetime. The demand for this pairing is real. We analyzed 776 Kortex MCP waitlist answers from September and October 2026, and Claude was the assistant people named most: 126 times, against 69 for ChatGPT and 61 for Gemini. We also found that 110 respondents wanted to ask their notebooks and get cited answers back. That was the third most common need in the survey.
Here's the path a request takes. Specifically, Claude calls one endpoint, `https://mcp.kortex-notebooklm.com/mcp`. Kortex relays the call to the Kortex extension in your own Chrome, and the extension asks Gemini Notebook using the Google session you're already signed in to. Consequently, Chrome has to be running, with the extension signed in. We built it this way so your Google login stays put: Kortex never stores your Google password or cookies.
Connecting takes a URL and a sign-in. In Claude Desktop or on the web, add a custom connector, paste the endpoint, and approve the Kortex consent page that opens. Claude Code does it in one command. A client that can't open a browser sends a Kortex API key instead, as `Authorization: Bearer kx_mcp_...`. Our [client setup guide](/docs/mcp-clients) also covers ChatGPT, Cursor, VS Code, Antigravity, Windsurf, Cline, Codex CLI and Zed.
Once it's connected, Claude can:
- ask a notebook a grounded question and get Gemini Notebook's citations back.
- read a source, or list everything in your library.
- save a job that runs hourly, daily or weekly, such as asking a notebook, saving the answer or making an Audio Overview (Kortex workflows docs, 2026).
Importantly, schedules fire from Chrome, so a closed laptop runs nothing. Our [Gemini Notebook MCP guide](/blog/notebooklm-mcp) explains how this differs from community servers that drive a hidden browser.
Kortex has a free plan. MCP and scheduled notebooks, however, are Pro features, at $9.99 a month or $4.92 a month billed yearly, and Lifetime includes them too. It works the other way, too. Similarly, Kortex's import button inside Claude sends the current chat to any Gemini notebook as a clean, labelled source.
As a result, you don't have to pick a side. Keep your sources in Gemini Notebook, write with Claude, and let Kortex connect the two.
Use Gemini Notebook and Claude together
Send any Claude chat to a notebook in one click with Kortex, free on Chrome. Kortex MCP, which lets Claude ask your notebooks directly, is included with Kortex Pro and Lifetime.
Get Kortex MCP with ProGet Kortex free on Chrome
## Frequently asked questions
### Is Gemini Notebook better than Claude Projects?
For research that has to stay faithful to specific documents, yes. Gemini Notebook answers from your sources with inline citations, and in a 2025 study NotebookLM hallucinated in 13% of outputs. For writing, coding and analysis that goes beyond the files, Claude Projects is the better workspace.
### How many files fit in a Claude Project vs a Gemini notebook?
A Gemini notebook holds 50 sources free and up to 600 on Ultra, at up to 500,000 words each. A Claude Project's knowledge shares Claude's context window, 200K tokens on most models, and paid plans switch to retrieval near that limit for up to 10x more content.
### Are Claude Projects free?
Yes, with a cap. Free Claude users can create up to five projects. Paid plans, which include Pro, Max, Team and Enterprise, have no stated project limit and add retrieval, so a project can hold up to 10 times more content than the context window alone allows.
### Can Claude read my Gemini notebooks?
Not natively, because Google publishes no public API for Gemini Notebook. Kortex MCP connects Claude to your notebooks through 145+ tools, so Claude can ask grounded questions and read sources. It's a Kortex Pro and Lifetime feature. Each call runs through the Kortex extension in your own Chrome, so the browser has to be open.
### Is Gemini Notebook or Claude better for studying?
Gemini Notebook, for most study work. The free tier allows 100 notebooks with 50 sources each, answers cite the page they came from, and the Studio makes flashcards, quizzes and audio reviews. Claude Projects is the better pick for drafting essays or getting coding help against course files.
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*Editorial note: fact-checked against the official help pages and docs linked above on October 26, 2026. Spotted something out of date? [Contact us](/support) and we will fix it, or read more [about Kortex](/about).*