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cs.CL2026
SPINE: Measuring LLM Sycophancy under Sustained Multi-Turn Pressure
Leyuan Tang, Kangda Wei, Tianyu Jiang +1
Large language models (LLMs) may abandon correct positions when users push back, exhibiting a failure mode known as sycophancy. Existing evaluations typically use short, prespecifi…
cs.LG2026
MMR-GRPO: Accelerating GRPO-Style Training through Diversity-Aware Reward Reweighting
Kangda Wei, Ruihong Huang
Group Relative Policy Optimization (GRPO) has become a standard approach for training mathematical reasoning models; however, its reliance on multiple completions per prompt makes…