As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/gpt-4o-mini-tts/

# GPT-4o mini TTS

OpenAI, GPT-4o family. Status: deprecated. Type: speech and audio. Released: 2025-03-20.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| OpenAI API | `gpt-4o-mini-tts` | https://api.openai.com/v1/audio/speech | https://developers.openai.com/api/docs/models/gpt-4o-mini-tts |
| Azure OpenAI (Microsoft Foundry) | `gpt-4o-mini-tts` |  | https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure |

## Pricing

- Text input: $0.60 per 1M tokens
- Audio output: $12 per 1M tokens
- Unit as published: per 1M tokens (USD)
- Source: https://developers.openai.com/api/docs/models/gpt-4o-mini-tts
- Last checked: 2026-10-15

## Specs

- Input: text
- Output: audio
- Context window: not published
- Max output: not published
- Open weights: no
- Licence: proprietary

## Where it stands

- Newer speech and audio models in the registry since its release: 98. The 5 newest:
  - NVIDIA Nemotron 3.5 Transcribe (30B-A4B) (2026-10-28) https://postcutoff.com/m/nemotron-3-5-transcribe/
  - Hy-SimulMT-30B-A3B (2026-10-22) https://postcutoff.com/m/hy-simulmt-30b-a3b/
  - Eleven Realtime v1 Max / Mini (2026-10-20) https://postcutoff.com/m/eleven-realtime-v1-max/
  - Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3) (2026-10-20) https://postcutoff.com/m/voxtral-mini-transcribe-3/
  - Voxtral Small Transcribe 3 (2026-10-20) https://postcutoff.com/m/voxtral-small-transcribe-3/
- Before it from OpenAI: TTS-1 / TTS-1 HD (2023-11-06) https://postcutoff.com/m/tts-1/
- After it from OpenAI: GPT-Realtime and GPT-Realtime mini (2025-08-28) https://postcutoff.com/m/gpt-realtime/
- Closed weights; access is hosted only.

## What stands out

- Steerable speech: Only current OpenAI TTS model listed in the models catalog; max 2000 input tokens. Source: https://developers.openai.com/api/docs/models/gpt-4o-mini-tts
- Instruction-steerable voice: An `instructions` field controls accent, emotional range, intonation, impressions, speed, tone and whispering. Source: https://developers.openai.com/api/docs/guides/text-to-speech

## Notes

Snapshots gpt-4o-mini-tts-2025-03-20 and gpt-4o-mini-tts-2025-12-15 (default). Older tts-1 ($15/1M chars) and tts-1-hd ($30). Deprecated 2026-10-01 (both snapshots, plus tts-1 and tts-1-hd): removal from the API on Jan 6 2027, recommended replacement gpt-realtime-2.1-mini (https://developers.openai.com/api/docs/deprecations).

```bash
curl https://api.openai.com/v1/audio/speech \
 -H "Authorization: Bearer $OPENAI_API_KEY" -H "Content-Type: application/json" \
 -d '{"model":"gpt-4o-mini-tts","voice":"alloy","input":"Hello"}' --output out.mp3
```

Sources:
- https://developers.openai.com/api/docs/models/gpt-4o-mini-tts
- https://developers.openai.com/api/docs/pricing
- Models overview: https://developers.openai.com/api/docs/models

Model page: https://postcutoff.com/m/gpt-4o-mini-tts/