TACO soft-suppresses positive GRPO credit on high tail-risk tokens (surprisal above local entropy) and consistently beats GRPO-style baselines on three LLMs and eight reasoning benchmarks while stabilizing long training.
AMC23: American mathematics competitions 2023 test set
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When Implausible Tokens Get Reinforced: Tail-Aware Credit Calibration for LLM Reinforcement Learning
TACO soft-suppresses positive GRPO credit on high tail-risk tokens (surprisal above local entropy) and consistently beats GRPO-style baselines on three LLMs and eight reasoning benchmarks while stabilizing long training.