Author

Yanis Labrak

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Preprint Jul 2026

When Synthetic Speech Is All You Have: Better Call GRPO

This work shows that Group Relative Policy Optimization (GRPO) extracts far more from the same synthetic speech than SFT, and traces the gain to behavior rather than representation: GRPO reduces insertion errors by improving stopping calibration and speech-to-text alignment by better anchoring attention to audio, leavi...

Shashi Kumar, Yanis Labrak, Hasindri Watawana et al. · 0 citations