GPT Researcher
#2 Researchby Open source (Assafelovic) · Best open-source research agent
GPT Researcher is the most popular open-source research agent: give it a question and it plans queries, scrapes ~20 sources in parallel, and writes a long-form cited report in minutes. Self-hosted with your own API keys, a typical report costs only a few cents in model usage.
Visit GPT Researcher ↗Last verified June 10, 2026
Pricing
Free + API costs (~$0.10/report)
Open source; pay your own LLM costs
Free tier: Yes · Open source: Yes
Strengths
- + Essentially free at any volume
- + Fully customizable pipeline and sources
- + Produces structured, cited reports
Limitations
- − Requires self-hosting and API keys
- − Report quality depends on source availability
Best for
DevelopersAutomated research pipelinesCost-sensitive heavy users
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