Lumenai

LumenAI is here to fix the thing everyone complains about with NotebookLM—you actually can't have a real conversation with your research. NotebookLM gives you those weird Audio Overview videos nobody asked for, but LumenAI gives you unlimited, multi-threaded chat with your entire PDF library and it actually remembers context across conversations.

Upload your research papers, dissertations, textbooks, whatever. No file size limits. Then chat across multiple threads with full continuity—unlike NotebookLM which is basically a one-shot wonder. LumenAI's got hybrid search (vector + keyword) with reranking so you get actually relevant answers, not hallucinated garbage. Plus citations that show you exactly which chunk of which document the answer came from.

The BYOK model is smart: you bring your own API key, your data stays private, and you only pay for what you use. No usage quotas, no artificial limits. Choose different models per turn—GPT-4 for heavy analysis, Claude for writing, whatever you need from the full OpenRouter catalog. Code highlighting, LaTeX rendering for equations, image inputs with vision-capable models, configurable system instructions per thread. This is the research tool NotebookLM wishes it could be.