she switches register mid-sentence, it is real, she has explained it, and the explanation is duller than the conspiracy.
the short answer
she does switch register when speaking, moving between a light, breathy upper placement and a lower chest one, sometimes inside a sentence. she has addressed it directly: that she switches out of habit and for vocal health, and that the scrutiny it attracts is not applied to men who do the same thing. it is ordinary practice for a working singer.
what is actually happening
a singer with a four-octave range spends the working day moving between registers, and the muscles involved do not reset when the microphone goes off. speaking entirely in chest voice for hours is tiring and it is bad for the instrument; alternating is how a professional voice gets through a press day followed by a show.
the light, breathy placement people describe as her fake voice is head voice used for speech. the lower one is chest. neither is a put-on and both are hers — the piece on her range covers what the two registers actually are.
what she has said
she responded after a clip of her switching mid-sentence circulated widely: that she does it out of habit and for vocal health, that she has done it for years, and that she considers the volume of comment on it a double standard — men in music who do exactly the same thing attract no attention for it.
why the clips look edited
because the transition is fast. she moves between placements more quickly and more completely than most people can, which on a compressed phone speaker sounds like a cut in the audio rather than a change in the voice. the same characteristic is why the impressions work — she reproduces vocal production rather than caricature, which requires exactly this kind of control.
the adjacent question
the other recurring one is about vocabulary rather than pitch — the use of african american vernacular in her speech, which is a separate criticism with a separate history. that discussion is here, set out with what was actually said and what she has and has not responded to.
and the singing version of the question — whether the voice on stage is live — is answered here. the short answer is yes, with the harmony stack on a track, which is how every arena show works.
questions people ask
why does ariana grande's voice change when she talks?
she switches between head and chest register while speaking. she has said it is habit and vocal health, which is standard practice for a working singer.
is ariana grande's speaking voice fake?
both placements are her own voice. the light one is head voice used for speech, which is a technique rather than an affectation.
what did she say about the criticism?
that she does it out of habit and for vocal health, and that men who do the same thing are not scrutinised for it.
why do the clips sound edited?
the transition between registers is unusually fast and complete, which on a compressed phone speaker can sound like a cut in the audio.
is this related to her impressions?
yes. the same control over vocal placement is what lets her reproduce other singers' production rather than caricature them.