Best AI Agents

Open Deep Research

LangChain's open source deep research agent

Open source research agent built with LangGraph. It plans a topic, runs searches in parallel with sub-agents and writes a report. Models and search tools are configurable.

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Gemini Deep Research

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Gemini mode that researches a topic and writes a report

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GPT Researcher

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Open source agent that writes cited research reports

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OpenAI Deep Research

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ChatGPT agent that writes multi-page research reports

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Perplexity

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Answer engine with a multi-step research mode

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