Open Deep Research (OSS)
Open-source agent that scopes topics, investigates the web, and writes cited research reports.
Sorting
Exa (Search & Research API)
Meaning-based search, crawling, and deep research endpoints designed for AI agents and apps.
Phind
Developer-centric AI search that iteratively searches, executes code, and composes rich, referenced answers.
You.com ARI
Agentic Research Interface that performs deep research with citations and customizable, multi-source synthesis.
Perplexity (with Deep Research)
Answer engine and autonomous deep-research mode that searches widely, reads sources, and synthesizes findings.
ChatGPT Deep Research
Agentic multi-step web research in ChatGPT that reads, reasons, and delivers cited, structured reports.