Replaying teacher trajectory prefixes and explicitly optimizing the historical prefix tokens improves small-model agent success rates over distillation and response-only GRPO baselines in TextCraft, BabyAI, and ALFWorld.
(2026).Well Begun, Half Done: Reinforcement Learning with Prefix Optimization for LLM Reasoning
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From Trajectories to Prefixes: Reusing Teacher Trajectories via Replayed Prefixes and Online Continuation
Replaying teacher trajectory prefixes and explicitly optimizing the historical prefix tokens improves small-model agent success rates over distillation and response-only GRPO baselines in TextCraft, BabyAI, and ALFWorld.