{
  "id": 6369513,
  "title": "From Concentration to Differentiation and Back: Routing Effective Rank in MoE Reasoning Cohorts",
  "url": "https://urgent.news/2026/09/06/from-concentration-to-differentiation-and-back-routing-effective-rank",
  "topic": "ai",
  "section": "AI",
  "published": "2026-09-06T05:43:22.000Z",
  "source": {
    "name": "arXiv cs.AI",
    "slug": "arxiv-cs-ai",
    "url": "https://arxiv.org/abs/2609.06403v1"
  },
  "original_language": "en",
  "account": null,
  "summary": "Test-time scaling produces cohorts of reasoning rollouts, yet there is no standard label-free account of how their internal computation reorganizes as inference unfolds. We introduce routing effective rank deff, the entropy-effective dimensionality of a cross-rollout graph built from MoE expert-routing similarity. Across ten MoE configurations and five math/science benchmarks, deff exhibits a…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}