MMSearch-OPD: Easy Made Hard, Hard Made Learnable for Long-Horizon Multimodal Search Agents
We introduce MMSearch-OPD, combining controllable data refinement with joint reinforcement learning (RL) and on-policy distillation (OPD).

ProofPaper ↗
Key points
- Multimodal deep search is moving from short queries to long-horizon investigations that continually acquire evidence.
- Our Refine pipeline performs targeted expansion of reasoning chains derived from existing simple multimodal questions.
- Parameterized transformations control search depth and cross-modal evidence requirements while reusing existing image--question pairs.
- Experiments show gains from data refinement and further improvements from joint training after SFT, indicating stronger long-horizon multimodal deep search capabilities.
Sources (2)
- [1]MMSearch-OPD: Easy Made Hard, Hard Made Learnable for Long-Horizon Multimodal Search AgentsarXiv (AI, ML, NLP, CV, robotics, multi-agent) · Oct 15, 05:16 PM
We introduce MMSearch-OPD, combining controllable data refinement with joint reinforcement learning (RL) and on-policy distillation (OPD).
Multimodal deep search is moving from short queries to long-horizon investigations that continually acquire evidence.
- [2]MMSearch-OPD: Easy Made Hard, Hard Made Learnable for Long-Horizon Multimodal Search AgentsHugging Face Daily Papers · Oct 15, 12:00 AM · same content
Extractive summary: sentences quoted from the sources.
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