# gpt-4o-mini-tts-2025-12-15

Calls to the model gpt-4o-mini-tts-2025-12-15 on OpenAI stop working on January 6, 2027.

- API: OpenAI (api.openai.com)
- Model: gpt-4o-mini-tts-2025-12-15
- Kind: Model retirement
- Takes effect: January 6, 2027
- Calls after that day: fail
- Calls it hits: `model gpt-4o-mini-tts-2025-12-15`
- Source: [Deprecations page](https://developers.openai.com/api/docs/deprecations)
- Page: https://www.okapi.bot/models/openai/gpt-4o-mini-tts-2025-12-15/

## What to use instead

Move to gpt-realtime-2.1-mini, recommended by OpenAI.

gpt-realtime-2.1-mini is not served on /v1/audio/speech: it runs only on the Realtime API (/v1/realtime, over WebRTC or WebSocket). Audio comes back as base64 chunks in response.output_audio.delta events (for example audio/pcm at 24 kHz), not as an mp3 or wav response body.