The new voice2voice from OpenAI allows for a conversational dialect, most prominently demonstrated in pop culture by the movie Her. Sam's tweet makes perfect sense in that context.
Sky's voice has been the default voice in voice2voice for almost a year now, and no one has made a connection to the Her voice until it started acting more conversational. It seems pretty obvious that OpenAI was looking for a more conversational assistant, likely inspired by the movie Her, and it would have been cool if the actress had helped make that happen, but she didn't, and here we are.
Also Juniper has always been the superior voice model. I just now realized that one of my custom GPTs kept having this annoying bug where the voice kept switching from Juniper to Sky, and that seems to be resolved now that Sky got removed.
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[1] https://www.reddit.com/r/ChatGPT/comments/177v8wz/i_have_a_r...