GlimpRouter is a training-free framework for Large Reasoning Models (LRMs) that reduces inference costs by selectively routing reasoning steps. It uses a lightweight model to generate the first token of each step, inferring step difficulty from its entropy to decide if a larger model is needed.
GlimpRouter is a smart system that helps big AI models (Large Reasoning Models) work faster and cheaper. It does this by having a small, fast AI model check the very first part of each thinking step. If that first part looks tricky, GlimpRouter sends the whole step to a bigger, more powerful AI model; otherwise, the small model handles it, saving time and computing power.
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