ResearchResearch paperAgents & Tool Use · Multimodal Models · Reinforcement Learning2 sources · Oct 15, 2026

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).

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)

Extractive summary: sentences quoted from the sources.

Before this

  1. Oct 14, 2026RM-OPD: On-Policy Distillation for Generative Reward Models
  2. Oct 14, 2026Occupancy Modeling via Drifting: One-Step Generation Enables Direct Policy Extraction
  3. Oct 14, 2026The Design Space of Tri-Modal Masked Diffusion Models
  4. Oct 14, 2026More Methods, Better Agents? A Reality Check on Self-Distillation in Agentic Reinforcement Learning
  5. Oct 13, 2026Demystifying On-Policy Distillation: Where Does the Teacher's Advantage Live?
  6. Oct 13, 2026Run fast, private agents on-device with LFM2.5-24B-A2B

Related