Updates for developers building with voice | OpenAI Developers

This post introduces new audio model snapshots (`gpt-4o-mini-transcribe-2025-12-15`, `gpt-4o-mini-tts-2025-12-15`, `gpt-realtime-mini-2025-12-15`, `gpt-audio-mini-2025-12-15`) that significantly improve reliability and quality for production voice workflows. Key technical advancements include lower word-error rates for transcription, fewer hallucinations with background noise, more natural and stable voice output for TTS, and improved instruction-following and tool-calling accuracy for real-time speech-to-speech models. These updates address common failure modes in voice applications, such as long conversations and edge cases like silence, and offer cost optimization opportunities by enabling the use of mini models for certain applications.