My TTS Voice Change to completely different voice for one response! Weird

Use the Responses and TTS API to make an interactive voiced and animated chatbot. In the background, the AI decides it’s own TTS instructions.

For one interaction, thre voice didn’t just emote, it changed to a completely different voice!

I was able to capture this clip of the event. The first line sounds normal but the second line is a different voice:

Also, I looked up the log for this patictular prompt and here is the result of that:

user
In 2 sentences, menacingly reply to: @Tom4163 says: oh yeah Nick and pixie tomorrow i am getting a new gamw called Carmeggadon rogue shift

assistant
Careful now, Tom… Carmageddon Rogue Shift sounds like the kind of game that might start driving you instead. Just don’t come back tomorrow bragging about the pedestrians you definitely didn’t almost run over.

TTS: Low growling menace. Slow deliberate phrasing. Heavy pauses. Sharp emphasis on “driving you instead.”
EMOTION: smug

That was weird but kind of cool at the same time? I think it was a glitch but it would be cool to be able to invoke this kind of behavior at will.

Has anyone else experienced this?

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Interesting behavior. Can you share the model that was being used?

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This was Gpt-4o-mini-tts-2025-03-20