LumenAI

What is LumenAI?

LumenAI is an AI-powered conversational research library built specifically for serious researchers, students, and knowledge workers. It allows you to upload an extensive library of PDFs, research papers, and textbooks, and then have intelligent, unlimited conversations with your documents using advanced AI models. Unlike many other tools, LumenAI focuses on providing true, continuous chat functionality across multiple threads, all while giving you full control over your data and costs through a Bring-Your-Own-Key (BYOK) model.

Features

LumenAI is engineered from the ground up to meet the rigorous demands of academic and professional research.

• Unlimited Document Support: Upload as many PDFs, papers, and textbooks as you need. There are no file size limits, making it ideal for handling large research corpora.

• True, Multi-Threaded Chat: Enjoy real, continuous conversations with your documents. Unlike some competitors (e.g., NotebookLM), LumenAI supports multiple, independent chat threads within the same workspace, each with full memory and context awareness.

• No Usage Quotas: With the BYOK model, you never hit artificial message or query limits. You only pay for the API tokens you consume, enabling truly unlimited research.

• Bring Your Own API Key (BYOK): Use your own API key from providers like OpenAI, Anthropic, or via OpenRouter. Your data stays private, your costs are transparent, and you pay directly for what you use.

• Advanced RAG Pipeline: Utilizes a hybrid search (combining vector and keyword matching) with re-ranking to ensure you receive the most accurate and relevant answers extracted from your documents.

• Code & LaTeX Support: Features beautiful syntax highlighting for code snippets and native LaTeX rendering for mathematical equations and formulas within chats.

• Multiple Workspaces: Organize your documents into separate workspaces for different projects, courses, or research topics. Switch between contexts seamlessly.

• Per-Turn Model Selection: Choose the most suitable Large Language Model (LLM) for each specific question. Use GPT-4 for complex analysis, Claude for nuanced writing, and many others for different tasks.

• Full OpenRouter Catalog: Browse and select from the complete catalog of models available on OpenRouter. Enable or disable specific models in your settings to perfectly match your workflow.

• Multimodal Inputs: Attach images via drag-and-drop, selection, or paste. Preview images directly in the chat and use vision-capable models to analyze content from JPEG, PNG, GIF, and WebP files.

• Configurable Chat Behavior: Set custom system instructions and adjust Retrieval-Augmented Generation (RAG) parameters on a per-thread basis, allowing you to fine-tune each conversation for your specific research needs.

• Built-in Citations: Every answer includes citations linked directly to the source document. Click on a citation to view the document info and the exact text chunk used to generate the AI's response.

How to Use LumenAI

Using LumenAI is designed to be straightforward for researchers at all levels:

1. Sign Up & Create a Workspace: Create an account and set up your first research workspace.

2. Upload Your Document Library: Drag and drop or select your PDFs, research papers, and textbooks into the workspace. There is no limit to the number or size of documents.

3. Configure Your API Key: In the settings, input your own API key (from OpenAI, Anthropic, or OpenRouter). This ensures privacy and direct cost control.

4. Start Conversing: Open a new chat thread within your workspace. Ask complex questions about your uploaded documents, request summaries, analyze data, or generate ideas.

5. Utilize Advanced Features: Switch between different AI models for different queries, create multiple threads for different lines of inquiry, and use the full-screen PDF viewer to reference documents side-by-side with the AI chat.

Pricing

LumenAI offers simple, transparent, and cost-effective pricing with a one-time purchase model—no subscriptions or hidden fees.

Early Bird Special: Lifetime Access - $29 (Regular Price: $39)

This one-time payment grants you:

• Lifetime access to the LumenAI platform.
• Unlimited document uploads and workspace creation.
• All future feature updates included.
• Access to the advanced RAG pipeline for large PDFs.
• Per-message model selection from a wide catalog.
• Full BYOK (Bring Your Own Key) functionality.

Note: With the BYOK model, you will need your own API key and will pay directly to the API provider (e.g., OpenAI) for token usage, typically at a very low cost per query. This means your total expense is the one-time software fee plus your controlled, pay-as-you-go API costs.

Cost Comparison:

• NotebookLM (Free*): Limited features, lacks true multi-threaded chat continuity.

• Claude Pro ($20/month): ~$240/year, with strict usage quotas and document size limits.

• LumenAI ($29 one-time + BYOK): One-time payment for unlimited software usage, plus your transparent API costs.

Helpful Tips

• Organize with Workspaces: Use separate workspaces for distinct projects to keep your research clean and context-specific.

• Leverage Model Strengths: Experiment with selecting different models per question—use GPT-4 for deep analytical work and Claude for drafting and summarization.

• Fine-tune Your Searches: Use the configurable RAG settings in longer threads to improve answer relevance, especially for very specialized topics.

• Check Citations: Always click on the citations provided in answers to verify the source and understand the context of the extracted information.

• Manage API Costs: Since you bring your own key, you can monitor and control your spending directly through your API provider's dashboard. Starting with faster, less expensive models for initial explorations can be cost-effective.

Frequently Asked Questions

What is BYOK (Bring Your Own Key)?

BYOK means you supply your own API key from a provider like OpenAI, Anthropic, or via OpenRouter. LumenAI uses your key to process requests, so you pay the API provider directly for token usage, ensuring data privacy and cost transparency.

How is this different from NotebookLM?

Unlike NotebookLM, which is limited to one conversational thread per notebook and lacks true chat continuity, LumenAI supports multiple, persistent chat threads with full memory. It's built specifically for extended, serious research conversations without arbitrary limits.

Why not just use Claude Projects or ChatGPT?

Claude Projects and ChatGPT often have strict usage quotas, message limits, and can struggle with very large document libraries. LumenAI offers unlimited usage through BYOK, handles large PDFs efficiently with its advanced RAG pipeline, and allows you to choose from a wide range of models, not just one.

What file formats are supported?

Currently, LumenAI primarily supports PDF documents, which are the standard for academic and research papers. The platform is optimized for high-performance ingestion and querying of PDF content.

How many documents can I upload?

There is no hard limit. You can upload an entire library of documents limited only by your storage needs. The system is designed to handle extensive research corpora.

What API providers are supported?

LumenAI supports any provider accessible through the OpenRouter catalog, which includes models from OpenAI (GPT-4, GPT-4o), Anthropic (Claude), Google, Meta, Mistral, and many others. You can also configure direct keys for major providers.

Do I need technical knowledge to use this?

No. While power users can leverage advanced settings, the core workflow—uploading PDFs and asking questions—is simple and intuitive, designed for all researchers and students.

What if I'm not satisfied?

LumenAI offers a 30-day money-back guarantee. If you are not satisfied with your purchase, you can request a full refund within 30 days.

What if there are more features added in the future?

The lifetime access purchase includes all future updates and feature additions to the LumenAI platform at no extra cost.