SJs voice has some very distinctive characteristics and she has distinctive inflections that she applies. None of that inflection, tonality, or characteristics are present in the chat bot voice. Without those elements, it can be said to be a voice with vaguely similar pitch and accent, but any reasonable “impersonation “ would at least attempt to copy the mannerisms and flairs of the voice they we’re trying to impersonate.

Listening to them side by side, the OpenAI voice is more similar to Siri than to SJ. That Sam Altman clearly wanted SJ to do the voice acting is irrelevant, considering the timings and the voice differences.

The phone call and tweet were awkward tho.