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OpenAI Deep Research
What ChatGPT, Claude, Gemini & Grok actually say · July 2026
The verdict
OpenAI Deep Research appears in 1 AI-ranked category — best position #1 for deep research api for agents.
Claude #1
The most mature agentic research product — o3-deep-research and o4-mini-deep-research in the Responses API do genuine multi-step browsing, code execution, and MCP tool use with inline citations, background mode for long jobs, and the strongest end-to-end report quality on hard queries
Where OpenAI Deep Research falls short, per the models
- Claude Cut the cost and latency — runs are slow and expensive enough that many agent builders reserve it for premium paths only
Top alternatives per the models: Perplexity Sonar Deep Research · Gemini Deep Research · Exa Research · Parallel
Rankings are computed from what the models answer, re-polled continuously · raw reasoning shown verbatim · methodology