OpenAI
gpt-4o-mini-tts-2025-12-15 model retirement
Stops workingSubscribe to OpenAIShare
On January 6, 2027, model gpt-4o-mini-tts-2025-12-15 will shut down. Requests specifying this model will fail after that date.
The error you get from January 6, 2027
What OpenAI answers a call to gpt-4o-mini-tts-2025-12-15 once the model is gone, as recorded from real responses:
{"error":{"message":"The model `gpt-4o-mini-tts-2025-12-15` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations","type":"invalid_request_error","param":null,"code":"model_not_found"}}What to use instead of gpt-4o-mini-tts-2025-12-15
Move to the recommended replacement, gpt-realtime-2.1-mini. This transition requires more than changing the model identifier, as gpt-realtime-2.1-mini is not served on /v1/audio/speech and runs only on the Realtime API at /v1/realtime over WebRTC or WebSocket. Responses return base64 audio chunks in response.output_audio.delta events instead of an mp3 or wav response body.
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.
In OpenAI's words
Shutdown date: Jan 6, 2027; Model / system: gpt-4o-mini-tts | gpt-4o-mini-tts-2025-12-15; Recommended replacement: gpt-realtime-2.1-mini
Facts
- 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
- Source
- Deprecations page
- Last updated
- Verified
- , against OpenAI's own pages
Questions
When does gpt-4o-mini-tts-2025-12-15 shut down?
Calls to the model gpt-4o-mini-tts-2025-12-15 on OpenAI stop working on January 6, 2027.
What happens to calls after January 6, 2027?
They fail from that day.
What error does gpt-4o-mini-tts-2025-12-15 return once it is shut down?
OpenAI answers HTTP 404: "The model `gpt-4o-mini-tts-2025-12-15` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations". Send another model to fix it.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
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Is your code calling this?
Okapi finds the calls this change hits in your repo and opens the pull request with the fix before January 6, 2027.