What is Deep Research?

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There are multiple products from different companies with names similar to “Deep Research”, including:

OpenAI’s Deep Research powered by their o3 model
Perplexity’s Deep Research powered by DeepSeek R1
Google’s Deep Research powered by Gemini
xAI’s Deep Search powered by Grok 3

All of these products are marketed as semi-autonomous agents that can assist with in-depth research on practically any topic. They are all powered by LLMs that use simulated reasoning.

What are "reasoning" AI models?