pipecat/changelog/4450.changed.md

• Changed the default OpenAI Realtime input audio transcription model from gpt-4o-transcribe to gpt-realtime-whisper for both OpenAIRealtimeSTTService and OpenAIRealtimeLLMService. The new model does not accept the prompt parameter; if a prompt is supplied alongside gpt-realtime-whisper, it is dropped automatically and a warning is logged. To keep using prompt hints, explicitly pin model="gpt-4o-transcribe" (or "gpt-4o-mini-transcribe").