| NotebookLM free | $0 | 50 sources | 200 MB or 500k words | Yes |
| NotebookLM via Google AI Plus | $4.99 | 100 sources | 200 MB or 500k words | Yes |
| NotebookLM via Google AI Pro | $19.99 | 300 sources | 200 MB or 500k words | Yes |
| NotebookLM via Ultra 5x (20 TB) | $99.99 | 500 sources | 200 MB or 500k words | Yes |
| NotebookLM via Ultra 20x (30 TB) | $199.99 | 600 sources | 200 MB or 500k words | Yes |
| ChatGPT Free | $0 | 5 files | Not listed | Yes |
| ChatGPT Plus or Go | $20 or $8 | 25 files | Not listed | Yes |
| ChatGPT Pro | from $100 | 40 files | Not listed | Yes |
| Claude Free | $0 | 5 projects | 30 MB | No |
| Claude Pro | $20 | Fits context, RAG | 30 MB | No |
| Claude Team | $25 monthly | Fits context, RAG | 30 MB | Yes |
ChatGPT caps are per project. Claude files are unlimited in count but must fit the context window. Neither OpenAI nor Google lists a per-file cap by tier. Google's 200 MB limit is on its sources page.