I honestly wouldn't have even thought they sounded all that similar were it not for openai themselves courting comparisons to the movie Her.
However, they both sound like AIs because Scarlett is playing that role and so is OpenAI's voice app.
I think ISWYDT.
You can certainly patent it.
"In general terms, a “utility patent” protects the way an article is used and works (35 U.S.C. 101), while a “design patent” protects the way an article looks (35 U.S.C. 171)."
Microsoft argued in court that you can not and won. See Apple vs Microsoft if I recall correctly.