LibriSpeech.

VoxCeleb covers speaker identity, not transcription — a different task that addresses the 'who spoke' question LibriSpeech ignores. Speaker verification became a standard parallel track in speech evaluation.

LibriSpeech test-other saturated; CHiME-6's multi-speaker dinner-party setup was the first major challenge where clean-speech progress didn't transfer. Where attention moved when LibriSpeech-other WER dropped below 4%.

GigaSpeech is a scale and diversity extension — 10× more data, multi-domain. A training and evaluation resource for robustness rather than a direct successor to LibriSpeech's narrow clean-speech task.