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#artificial intelligence Preprint Sep 2026

CounterRoute: Self-Routed Reasoning via Hierarchical Counterfactual Credit Assignment

Reasoning-capable language models often produce long chains of thought when direct answers suffice, wasting inference compute. Dual-mode models offer both thinking and direct-answer modes, but typically leave mode selection to users. Automating this selection while improving responses under both modes is challenging be...

Ruo-Chen Jiao, B. Fetahu, Zhen-Yu Shi et al. · 0 citations
#artificial intelligence Preprint Sep 2026

CHART: A Harness-Rotation Curriculum for Harness-Robust Search Agents

Search agents are usually trained under a single harness. But once an agent is deployed in a real application, its harness is frequently updated (e.g., a rewritten system prompt) to fit production needs. This exposes a fragility of post-trained agents: because a learned behavior is entangled with its training harness,...

Xin-Lu Zhang, Ying-Chun Lin, Zhi-Han Zhang et al. · 0 citations

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