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OpenAI's TTS does this. You can hear it in regular ChatGPT's voice mode (which this demo is based on, it uses the same animations on the robot's face). It will also sometimes randomly hallucinate syllables or whole nonsense words, although that is rarer.

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Is there a setting for this in the ChatGPT app? I have never once noticed it produce an "uh" or repeated syllable like "I... I think I did pretty well."

Really? Have you used it much? I haven't used it a ton but it definitely says "uh" and has various other artifacts. Maybe they have improved it recently but it was quite obvious when I first got access. Or maybe some of the voices are more prone to it than others.

The naturalness of the speech is extremely good, though.

I use the conversation mode (head phones icon) and it regularly says uh. It’s cute but spurious and unnecessary.

Huh, TIL.

I noticed the stutter too, interesting to see that is what TTS just does now, and not a sign of a human and a sound filter.

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