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ThinkSafe generates its own safety alignment data from the frozen student, and beats GRPO on safety at about one-seventh the wall-clock time

AspireAI community · arXiv (cs.AI)
Reinforcement-learned reasoning models can lose safety alignment, and distilling from an external teacher restores it at the cost of reasoning performance. ThinkSafe formalises safety realignment as a KL projection in which the student's own filter-accepted distribution is uniquely KL-optimal, then generates its alignment data from the frozen student rather than a teacher: refusal steering elicits safety reasoning and a safety guard filters the responses before offline fine-tuning. The analysis bounds steering-induced target distortion and gives a sufficient condition for lower average target KL than teacher distillation. On DeepSeek-R1-Distill and Qwen3 the authors report substantial safety improvements with competitive reasoning performance, and on Qwen3-0.6B better safety with comparable reasoning to GRPO in roughly one-seventh the wall-clock time including data generation. The headline comparison is at 0.6B scale.
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