Energy-Aware Routing to Large Reasoning Models

• URL: http://arxiv.org/abs/2601.00823v1
• Date: Tue, 23 Dec 2025 17:33:29 GMT
• Title: Energy-Aware Routing to Large Reasoning Models
• Authors: Austin R. Ellis-Mohr, Max Hartman, Lav R. Varshney,
• Abstract summary: Large reasoning models (LRMs) have heterogeneous inference energy costs.<n>To reduce energy, it is important to choose the right LRM and operate it in the right way.
• Score: 12.12696006896269
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large reasoning models (LRMs) have heterogeneous inference energy costs based on which model is used and how much it reasons. To reduce energy, it is important to choose the right LRM and operate it in the right way. As a result, the performance of systems that dispatch tasks to different individual LRMs depend on the balance between mean energy provisioning and stochastic fluctuations. The critical regime is the unique operating point at which neither auxiliary energy nor baseline energy is systematically wasted. Increasing baseline supply shifts the system toward persistent over-supply and baseline-energy waste, while reducing supply induces persistent reliance on auxiliary energy. Yet in this regime, performance remains volatility-limited and so a second-order characterization provides further insights that we develop. Here, performance is governed by how variability is absorbed across time, models, and execution choices. This perspective highlights variance-aware routing and dispatch as a principled design axis, and provides a theoretical basis for developing energy-aware model routing policies. Routing behavior is characterized when dispatch policies are based on training-compute and inference-compute scaling laws for LRMs.

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