Is it RL or Data? A Controlled Comparison of GRPO and Rejection-Sampling Fine-Tuning

arXiv:2610.25812 · cs.LG · Submitted 2026-10-19 · Read on arXiv

cs.LG

Submitted: 2026-10-19

Updated: 2026-10-19

Terminology

• Fine-Tuning — 1× in this paper · explained in 5 episodes
• GRPO — 1× in this paper · explained in 6 episodes

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