The closest alternative to o3 Deep Research is GPT Chat Latest — comparable intelligence (— vs —); for a cheaper option, Claude Opus 4.8 runs $5.00/M vs $10.00/M; for more speed, Morph V3 Large hits 3.2k t/s; and the best open-weight substitute is MiniMax M3.
GPT Chat Latest is the closest alternative to o3 Deep Research, with an Intelligence Index of — (o3 Deep Research scores —) at $5.00 per million input tokens.
Yes — Claude Opus 4.8 costs $5.00 per million input tokens versus $10.00 for o3 Deep Research, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to o3 Deep Research — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.