Sonar Deep Research

Perplexity's research-focused variant in the Sonar line, equipped with extended reasoning and search capabilities to handle in-depth research tasks.

Strengths

Combines search-based information retrieval with extended reasoning to synthesize findings across multiple sources and explore research topics in depth.

Best for

Deep research, literature synthesis, multi-source analysis, and complex question-answering that benefits from current information and structured reasoning.

Limitations

The 128k token context window is smaller than Sonar Pro's 200k, which may constrain very large research document processing; trades raw compute for focused research-oriented capabilities.