GPT-4o mini TTS
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) still priced.
- Input
- text
- Output
- audio
- License
- proprietary
- Pricing
- text input: $0.6 · audio output: $12 (per 1M tokens (USD)) source
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| OpenAI API | gpt-4o-mini-tts | https://api.openai.com/v1/audio/speech | docs |
| Azure OpenAI (Microsoft Foundry) | gpt-4o-mini-tts | — | docs |
Notable capabilities (2)
- Steerable speech: Only current OpenAI TTS model listed in the models catalog; max 2000 input tokens. source
- Instruction-steerable voice: An `instructions` field controls accent, emotional range, intonation, impressions, speed, tone and whispering. source
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:
Other OpenAI models
GPT-6.1 Sol · GPT-6 Luna · GPT-6 Sol · GPT Image 2.5 Flare · GPT Image 2.5 Sunburst · GPT-6 Astra · GPT-Live-Transcribe · GPT-Transcribe · GPT-5.6 Terra · GPT-Live 1 · GPT-Realtime-2.1 · GPT-Realtime-2 · GPT-Realtime-Translate · GPT-Rosalind · GPT-Audio-1.5 (and gpt-audio / gpt-audio-mini) · GPT-5.3-Codex · gpt-oss-120b · gpt-oss-20b · text-embedding-3-large · text-embedding-3-small · GPT-5.6 Luna · GPT-5.6 Sol · GPT-Realtime-Whisper · GPT-5.5 Pro · GPT-5.5 · GPT Image 2 · GPT-5.4 · GPT-Realtime-1.5 · GPT-4.1 · GPT-4o · TTS-1 / TTS-1 HD · Whisper large-v3 / large-v3-turbo (open weights) · GPT-Realtime and GPT-Realtime mini · o3 · GPT-4o Transcribe / Mini Transcribe / Transcribe Diarize · Whisper (whisper-1 API) · Sora 2