Verified75% confidenceFactTime unknown
The mainstream metric for evaluating speech naturalness is Mean Opinion Score (MOS), where human listeners rate samples on a scale of 1 to 5.
3
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75%
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Long-term
Relevance
9/12/2026
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UnverifiedSpeech generated by end-to-end TTS models based on deep learning typically achieves a naturalness MOS score of 4.0–4.5 (out of 5), approaching the level of human recordings.72% similarUnverifiedSpeech-to-Speech Index is an evaluation benchmark measuring the comprehensive capabilities of speech-to-speech models, encompassing a weighted score across multiple dimensions including speech comprehension accuracy, response relevance, naturalness rating, and first-token output latency.70% similarUnverifiedAutomated machine evaluation of speech naturalness commonly uses prediction models such as UTMOS as substitutes for human evaluation.66% similar
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