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ComplLLM: Fine-tuning LLMs to Discover Complementary Signals for Decision-making

2026-02-23 · Ziyang Guo, Yifan Wu, Jason Hartline, Kenneth Holstein, Jessica Hullman arxiv

Multi-agent decision pipelines can outperform single agent workflows when complementarity holds, i.e., different agents bring unique information to the table to inform a final decision. We propose ComplLLM, a post-training framework based on decision theory that fine-tunes a decision-assistant LLM using complementary information as reward to output signals that complement existing agent decisions. We validate ComplLLM on synthetic and real-world tasks involving domain experts, demonstrating how the approach recovers known complementary information and produces plausible explanations of complementary signals to support downstream decision-makers.

📄 PDF Abstract BibTeX arXiv:2602.19458

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