#deep research
Agents that perform multi-step web research and produce cited reports.
Category distribution
ChatGPTFreemium
ChatGPT is the world's most-used AI chatbot: with GPT-5.5 it handles text, voice, images and video, web search and advanced reasoning.
PerplexityFreemium
Perplexity (San Francisco, 2022) leads the 'direct answer with sources' category. Pro $20/mo unlocks Deep Research, GPT-5.4, Claude Opus 4.6 and Gemini 3.1 Pro. Max $200, Enterprise from $40/user.
NotebookLMFreemium
NotebookLM is a grounded research assistant: everything it outputs is based on your uploaded sources (PDF, links, Drive, YouTube, slides). Generous free tier; Plus at $7.99/mo via Google AI Plus.
GeminiFreemium
Gemini is Google's AI family: consumer chatbot, native Gmail/Docs/Drive integration, Veo 3.1 video generation and API via Google AI Studio.
PerplexityFreemium
Perplexity blends web search and LLMs (GPT, Claude, Gemini, Grok) into a single conversational UI with always-cited sources and the Sonar API for developers.
Perplexity for StudentsFreemium
Perplexity Education Pro: $10/mo for students with verified .edu emails (vs regular $20). All Pro features: unlimited Pro Search, Deep Research, GPT-5.4, Claude Opus, Gemini 3.1.
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