OpenAI Quietly Bumps gpt-4o-mini TTS and Transcription to December 2025 Checkpoints

Developers using OpenAI's text-to-speech and transcription APIs are getting an automatic model upgrade today — a silent improvement that could affect latency, quality, and downstream application behavior.

OpenAI is updating the model pointers for gpt-4o-mini-tts and gpt-4o-mini-transcribe to the December 2025 (2025-12-15) checkpoint, as @pbbakkum announced. The upgrade is automatic — developers using these APIs will get the new models without changing any code.

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