The closest alternative to Sonar Deep Research is Sonar Pro Search — comparable intelligence (— vs —); for a cheaper option, Qwen3.7 Max runs $1.25/M vs $2.00/M; for more speed, Morph V3 Large hits 3.1k t/s; and the best open-weight substitute is MiniMax M3.
Sonar Pro Search is the closest alternative to Sonar Deep Research, with an Intelligence Index of — (Sonar Deep Research scores —) at $3.00 per million input tokens.
Yes — Qwen3.7 Max costs $1.25 per million input tokens versus $2.00 for Sonar Deep Research, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to Sonar Deep Research — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.