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Realtime API 1.5 - Tone changes per call

OpenAI Developer Community May 11, 2026
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nbo2:

Does the realtime model support temperature parameter?

There is no temperature control parameter or temperature echo return in the realtime session object. It was taken out of the non-beta version of realtime. There is no indication of what the model is being run at - or if there is complete oversight of the need to constrain temperature on voice models to avoid the very symptoms reported here.

Chat Completions has the model gpt-audio-1.5, where you can experiment with lowered temperature and see consistency when going even lower than the default 0.8 of 0.6-1.0 range you previously had, but where as low as โ€œ0โ€ can be problematic and can have the AI start generating silence. No 2.0 version there.

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