Beyond the obvious, that they are using different models and one may simply be higher quality than the other, there are also differences in the expected usage that make direct comparisons difficult.
The most likely explanation however is that TikTok auto captions simply [aren’t as automatic as you think](https://newsroom.tiktok.com/en-us/introducing-auto-captions):
>With this feature, creators have the power to edit the text of their captions once they’re generated.
YouTube does technically allow the same but it’s likely not done as much given the volume of content, average length of videos etc.
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