# Gemini Notebook vs OpenAI Codex

> Gemini Notebook: Google's Gemini Notebook, formerly NotebookLM, answers questions and builds summaries from your own sources
> OpenAI Codex: OpenAI's coding agent that writes, reviews and runs code from terminal, IDE, desktop or cloud

- Gemini Notebook profile: https://finderatlas.com/tools/notebooklm
- OpenAI Codex profile: https://finderatlas.com/tools/openai-codex
- Comparison page: https://finderatlas.com/compare/notebooklm-vs-openai-codex
- Last reviewed: November 2026

## Verdict

Gemini Notebook is listed under AI Assistants and OpenAI Codex under Coding AI. Both have a free plan or trial. Only Gemini Notebook is available on iOS and Android. Only OpenAI Codex is available on Windows, macOS and Linux and offers an API.

### Choose Gemini Notebook if

- You want a tool built for summarizing and questioning your own documents.
- Answers cite the uploaded sources, so claims can be checked against the original text.
- Free Standard tier with 100 notebooks and 50 sources per notebook.

### Choose OpenAI Codex if

- You want a tool built for delegating coding tasks to an agent.
- Included with ChatGPT plans, with a free tier and an $8 Go tier.
- Open-source CLI under the Apache-2.0 license.

## Pricing

| | Gemini Notebook | OpenAI Codex |
| --- | --- | --- |
| Pricing model | Freemium | Freemium |
| Free plan or trial | Yes | Yes |
| Starting price | $0 | $0 |

## Features

| Feature | Gemini Notebook | OpenAI Codex |
| --- | --- | --- |
| Source-grounded chat | Yes | Not listed |
| Audio Overviews | Yes | Not listed |
| Video Overviews | Yes | Not listed |
| Study tools | Yes | Not listed |
| Reports, slide decks and infographics | Yes | Not listed |
| Multiple source types | Yes | Not listed |
| Cloud computer | Yes | Not listed |
| Gemini app sync | Yes | Not listed |
| Sharing and public notebooks | Yes | Not listed |
| Codex CLI | Not listed | Yes |
| IDE extension | Not listed | Yes |
| Desktop app | Not listed | Yes |
| Cloud tasks | Not listed | Yes |
| Code review | Not listed | Yes |
| Non-interactive mode | Not listed | Yes |
| MCP, skills and plugins | Not listed | Yes |
| Subagents and web search | Not listed | Yes |
| Session resume and images | Not listed | Yes |
| Mobile remote control | Not listed | Yes |

## Platforms

| Platform | Gemini Notebook | OpenAI Codex |
| --- | --- | --- |
| Web | Yes | Yes |
| Windows | No | Yes |
| macOS | No | Yes |
| iOS | Yes | No |
| Android | Yes | No |
| API | No | Yes |
| Browser Extension | No | No |
| Linux | No | Yes |
| CLI | No | Yes |
| VS Code Extension | No | Yes |
| JetBrains Plugin | No | Yes |

## Gemini Notebook strengths

- Answers cite the uploaded sources, so claims can be checked against the original text
- Free Standard tier with 100 notebooks and 50 sources per notebook
- Wide range of outputs, including Audio Overviews, Video Overviews, mind maps, flashcards, quizzes and slide decks
- Accepts PDFs, websites, YouTube videos, audio files, Google Docs and Google Slides
- Available on web, iOS and Android, and synced with the Gemini app

## Gemini Notebook limitations

- Works from the sources you add and is not built for live web news search
- Higher limits require a Google AI subscription; Ultra starts at $99.99 per month
- The cloud computer for code execution started with Ultra and Workspace AI Ultra Access customers, with Pro rollout still described as upcoming
- No public API for the consumer product, and the renamed brand can make older guides and app listings confusing

## OpenAI Codex strengths

- Included with ChatGPT plans, with a free tier and an $8 Go tier
- Open-source CLI under the Apache-2.0 license
- Available in the terminal, VS Code-based editors, the ChatGPT desktop app and the cloud
- Supports MCP, skills, plugins and subagents
- API-key option lets teams pay at API rates instead of a subscription

## OpenAI Codex limitations

- Plus has message limits per five hours that vary widely by model
- Cloud features are not available on the API Key plan
- Higher usage needs Pro, which starts at $100 per month
- Free and Go plans offer only GPT-6 Luna in the desktop app

## FAQ

**Is Gemini Notebook better than OpenAI Codex?**

It depends on your workflow. Gemini Notebook is built for summarizing and questioning your own documents. OpenAI Codex is built for delegating coding tasks to an agent.

**What are the key feature differences between Gemini Notebook and OpenAI Codex?**

Gemini Notebook: Google's Gemini Notebook, formerly NotebookLM, answers questions and builds summaries from your own sources. OpenAI Codex: OpenAI's coding agent that writes, reviews and runs code from terminal, IDE, desktop or cloud.

**Does Gemini Notebook or OpenAI Codex have a free plan?**

Yes, both do. Gemini Notebook is freemium and OpenAI Codex is freemium, and each has a free plan or trial.

**Which is cheaper, Gemini Notebook or OpenAI Codex?**

Both can be used for free. Paid plans differ in limits and features, so compare the tiers in the pricing table above.