Morning Edition · Thursday, July 30, 2026Published at 1:37 AM EDT · New York

Study Probes Why RL-Trained Reasoning Models Beat Supervised Fine-Tuning

Researchers locate the advantage in representational quality for mathematical problem-solving rather than in the final-answer accuracy that benchmarks reward.

A new arXiv paper examines a result that has become widely accepted, that large reasoning models trained with reinforcement learning (RL) outperform their supervised fine-tuned (SFT) versions on mathematical reasoning. The authors ask where…