Adding a smiley improves performance according to Logan Kilpatrick, head of developer relations at OpenAI.
> There's a lot of really small silly things, like adding a smiley face, increases the performance of the model.
> You could imagine on the order of one or 2%, which for a few sentence answer might not even be a discernible difference. Again, if you're generating an entire saga of texts, the smiley face could actually make a material difference for you, but for something small and textual it might not.
It lets you map this key to fix this issue and allows many more mappings.
[0] https://karabiner-elements.pqrs.org/