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Rewarding Efficient Reasoning Improves Abstention on Underspecified Tasks in Reasoning Models

arXiv:2609.20846v1 Announce Type: new Abstract: While modern large reasoning models (LRMs) excel at providing correct answers in many tasks, we provide additional evidence for the observation that they often struggle with a critical capability: knowing when to abstain from answering. We analyze thi…

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  1. 2026-09-21 04:00 · arXiv cs.CL
    Rewarding Efficient Reasoning Improves Abstention on Underspecified Tasks in Reasoning Models

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