{"slug": "do-we-need-complex-topology-control-distinct-peer-random-routing-improves-cost", "title": "Do We Need Complex Topology Control? Distinct-Peer Random Routing Improves Cost-Efficiency in Sparse Multi-Agent Debate", "summary": "A new arXiv paper (2609.27150v1) reports that a simple random-without-replacement routing policy, in which each agent debates with two distinct newly sampled peers per round, consistently improves the accuracy-cost trade-off of sparse multi-agent debate (MAD) for large language models, outperforming more sophisticated topology-control mechanisms. The authors also find that lightweight deliberation stopping substantially reduces inference cost while preserving competitive accuracy, and conclude that learned topology adaptation should be benchmarked against strong simple routing and stopping baselines before its added complexity is justified.", "body_md": "arXiv:2609.27150v1 Announce Type: new \nAbstract: Multi-agent debate (MAD) has emerged as a promising paradigm for improving the reasoning accuracy of large language models (LLMs) through iterative peer interaction. Communication topology plays a central role in this process, motivating increasingly sophisticated mechanisms that learn, adapt, or dynamically reconfigure agent interactions to improve accuracy or reasoning reliability. Meanwhile, prior studies suggest that much simpler sparse communication can already achieve competitive performance at substantially lower cost. In this work, we take a closer look at sparse MAD and ask whether complex topology control is actually necessary to improve collective reasoning. We find that a simple random-without-replacement routing policy, which lets each agent debate with two distinct and newly sampled peers at every round, provides a surprisingly strong baseline and consistently improves the accuracy-cost trade-off of sparse MAD. Building on this observation, we further study deliberation stopping and show that lightweight stopping can substantially reduce inference cost while preserving competitive accuracy. Our results suggest that sophisticated topology control such as learned topology adaption should be evaluated against strong simple routing and stopping baselines before its additional complexity is justified.", "url": "https://wpnews.pro/news/do-we-need-complex-topology-control-distinct-peer-random-routing-improves-cost", "canonical_source": "https://arxiv.org/abs/2609.27150", "published_at": "2026-09-24 04:00:00+00:00", "updated_at": "2026-09-24 04:30:18.926591+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "ai-agents", "ai-research", "ai-infrastructure"], "entities": ["arXiv", "multi-agent debate", "large language models"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/do-we-need-complex-topology-control-distinct-peer-random-routing-improves-cost", "markdown": "https://wpnews.pro/news/do-we-need-complex-topology-control-distinct-peer-random-routing-improves-cost.md", "text": "https://wpnews.pro/news/do-we-need-complex-topology-control-distinct-peer-random-routing-improves-cost.txt", "jsonld": "https://wpnews.pro/news/do-we-need-complex-topology-control-distinct-peer-random-routing-improves-cost.jsonld"}}