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Agent-Editing World Model: Rethinking World Modeling for LLM Agents

Research LLM Agents

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Content 95
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Merged summary

TL;DR - Agent-Editing World Model (AEWM) improves long-horizon LLM agents by revising contaminated reasoning and action histories instead of predicting complex tool responses. Its EditAct framework consistently boosts agent performance across search, terminal, and software-engineering tasks.

  • AEWM classifies decisions as Critical, Exploratory, or Noisy, then edits noisy reasoning-action continuations before subsequent decisions.
  • Its Action Judge achieves 70.5% macro-F1, 10.6 points above the strongest frontier baseline.
  • Across six benchmarks and three agent backbones, EditAct improves average scores by 3.2–6.7 points over the strongest baseline.
  • Training on verified EditAct trajectories improves results by 2.2–2.6 points over Self-RFT without requiring online AEWM guidance.

Sources (1)

Agent-Editing World Model: Rethinking World Modeling for LLM Agents

arXiv cs.CL Shuang Sun, Guoxin Chen, Fanzhe Meng, Jia Deng, Huatong Song, Jinhao Jiang, Wayne Xin Zhao, Hongteng Xu, Ji-Rong Wen 2026-09-23 arXiv:2609.28416
Public signals Hugging Face upvotes 13
Providers: Hugging Face · Upvotes 13 OpenAlex · N/A Publisher · N/A Semantic Scholar · N/A X · N/A Fetched 2026-09-25 14:16:18.453298 UTC

TL;DR - Agent-Editing World Model (AEWM) improves long-horizon LLM agents by revising contaminated reasoning and action histories instead of predicting complex tool responses. Its EditAct framework consistently boosts agent performance across search, terminal, and software-engineering tasks.

  • AEWM classifies decisions as Critical, Exploratory, or Noisy, then edits noisy reasoning-action continuations before subsequent decisions.
  • Its Action Judge achieves 70.5% macro-F1, 10.6 points above the strongest frontier baseline.
  • Across six benchmarks and three agent backbones, EditAct improves average scores by 3.2–6.7 points over the strongest baseline.
  • Training on verified EditAct trajectories improves results by 2.2–2.6 points over Self-RFT without requiring online AEWM guidance.
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