Xiuyu Li(@sheriyuo):GEAR turns long-context grounding into a reward-shaping problem, by rewarding n-gram overlap with annotated evidence while penalizing overlap with distractors, reducing both copying and reasoning length. The method still depends on automatically generated evidence annotations and overlap proxies, but it gives long-context RL a concrete selectivity objective instead of another generic accuracy bonus. Copy Less, Ground More: Overcoming Repetitive Copying in Long-Context Reasoning via Evidence-Aware Reinforcement Learning Paper:

Xiuyu Li

@sheriyuo

Researcher @StepFun_ai | Working on long-horizon tasks | Prev @RUC1937 | Opinions are my own

Joined February 2026

1.7K Following 12.4K Followers

Xiuyu Li@sheriyuo

2026.07.22 03:59

GEAR turns long-context grounding into a reward-shaping problem, by rewarding n-gram overlap with annotated evidence while penalizing overlap with distractors, reducing both copying and reasoning length. The method still depends on automatically generated evidence annotations and overlap proxies, but it gives long-context RL a concrete selectivity objective instead of another generic accuracy bonus. Copy Less, Ground More: Overcoming Repetitive Copying in Long-Context Reasoning via Evidence-Aware Reinforcement Learning Paper: