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SFT-then-RL Outperforms Mixed-Policy Methods for LLM Reasoning

Mixed-policy LLM reasoning gains stem from buggy baselines; fixing optimizer and loss bugs makes standard SFT-then-RL outperform them by up to 22 points.

Alexis Limozin, Eduard F Ďurech, Torsten Hoefler, Imanol Schlag and 1 more

Sydney Poster Session 1, Tue, Dec 8, 10:00 AM–1:00 PM, Hall 1-4 · Published 2026

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AI panel: 16 of 20 reviewers recommend it
lenient 4/5
medium 8/10
strict 4/5