The shortlist
Research agents browse, read, and synthesize with sources attached. The split: managed products that answer instantly, versus open-source researchers you run with your own API keys — cheaper at volume and fully under your control.
Freemium
Fast cited answers with agentic deep-research mode, zero setup, free tier. The default choice when you want answers now rather than infrastructure.
— You need auditable control over sources and retrieval — it is a consumer product.
29k stars · Open source · Python
The most adopted open-source autonomous researcher in the index — produces full cited reports using your own API keys, so per-report cost stays yours to control.
— You want a polished consumer product rather than a repo you run yourself.
31k stars · Open source · Python
Stanford's research system that writes Wikipedia-style articles with citations from scratch — the strongest open option when the output should read like a structured report, not a chat answer.
— You need conversational research rather than long-form report generation.
Citations tell you where a claim came from, not that it's true — every research agent can still mis-read a source. For anything decision-grade, spot-check the two or three citations that carry the conclusion.
