GPT-4o mini TTS overview
GPT-4o mini TTS by OpenAI
GPT-4o Mini TTS API delivers efficient text-to-speech generation for natural voice experiences, assistants, and audio applications.
GPT-4o mini TTS specs
- Model ID
openai/gpt-4o-mini-tts- Developer
- OpenAI
- Input
- Text
- Output
- Audio
- Endpoint
POST https://api.aimlapi.com/v1/tts
Overview
GPT-4o-mini-TTS is a state-of-the-art text-to-speech (TTS) model built on the GPT-4o mini architecture. It transforms text into high-quality, realistic speech featuring natural intonation and expressiveness. The model offers robust multilingual support and customizable voice parameters, making it ideal for diverse TTS applications.
Technical Specifications
- Model Type: Based on GPT-4o mini architecture optimized for text-to-speech
- Style Control: Customizable tone, emotion, pacing, accent via prompt instructions
- Delivery Modes: Supports synchronous and streaming audio generation
Performance Benchmarks
- Realistic voice quality with natural prosody and intonation tested on standard TTS datasets
- Low latency enabling real-time interaction with average streaming delay under 100ms
- High intelligibility scores across 40+ international languages
- Voice customization parameters result in expressive and emotionally varied outputs
- Robust multilingual performance validated in noisy and accented speech synthesis environments
Key Features
- Converts text to speech with natural, human-like intonation
- Supports 11 built-in voices spanning multiple styles and genders
- Covers more than 40 languages and dialects (according to Whisper language list)
- Adjustable accent, emotion, intonation, speed, and timbre settings
- Outputs audio in MP3, WAV, OPUS, FLAC, PCM, and other formats
- Enables real-time speech synthesis and streaming audio support
- Multi-language support with seamless voice switching
Use Cases
- Voice assistants and conversational agents requiring natural multilingual speech
- Audiobook and e-learning content generation with adjustable emotion and pace
- Accessibility tools for visually impaired users needing realistic speech output
- Real-time communication aids and live broadcast voice synthesis
- Custom voice branding and multimedia voiceover production
Comparison with Other Models
vs Google WaveNet: Google WaveNet offers extremely high-fidelity audio but lacks GPT-4o-mini’s broad language and customization flexibility. GPT-4o-mini-TTS enables adjustable emotional intonation and real-time streaming, which WaveNet generally does not support.
vs OpenAI Whisper TTS: Whisper TTS focuses primarily on speech recognition with limited TTS development, while GPT-4o-mini-TTS specializes in expressive, multi-language speech synthesis with multiple voice options.
vs Amazon Polly: Amazon Polly provides many voices and languages but is less flexible in real-time streaming and fine control of emotional parameters compared to GPT-4o-mini-TTS. GPT-4o-mini-TTS offers richer customization and open domain adaptability.
vs Microsoft Azure TTS: Azure TTS delivers competitive quality but may have higher latency. GPT-4o-mini-TTS excels in low-latency streaming and supports a larger number of languages and voice customizations.
Use cases
- Voice assistants and conversational agents requiring natural multilingual speech
- Audiobook and e-learning content generation with adjustable emotion and pace
- Accessibility tools for visually impaired users needing realistic speech output
- Real-time communication aids and live broadcast voice synthesis
- Custom voice branding and multimedia voiceover production
GPT-4o mini TTS API pricing
| Usage | Price | Unit |
|---|---|---|
| Speech generation | $0.001 | per generation |
Prices from the AI/ML API price list, checked on Nov 4, 2026.
GPT-4o mini TTS vs other speech models: prices
AI/ML API rates for 5 models, per generation.
| Model | Per generation |
|---|---|
 GPT-4o mini TTS | $0.001 |
 Inworld TTS-1 | $0.007 |
| Inworld TTS-1-Max | $0.013 |
 Qwen3 TTS Flash | $0.013 |
 MiniMax Speech 2.6 Turbo | $0.078 |
How to use the GPT-4o mini TTS API
View docs
Build with your agent
Give your agent the model details, code and documentation.
1Get your API key
Create API keyexport AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"2Make your first request
curl 'https://api.aimlapi.com/v1/tts' \
-H "Authorization: Bearer $AIMLAPI_KEY" \
-H 'Content-Type: application/json' \
-d '{
"model": "openai/gpt-4o-mini-tts",
"text": "Your order has shipped. It will arrive on Thursday between nine and eleven in the morning. Reply to this message if you need to change the delivery time."
}'import os
import requests
headers = {
"Authorization": f"Bearer {os.environ['AIMLAPI_KEY']}",
"Content-Type": "application/json",
}
payload = {
"model": "openai/gpt-4o-mini-tts",
"text": "Your order has shipped. It will arrive on Thursday between nine and eleven in the morning. Reply to this message if you need to change the delivery time."
}
response = requests.post("https://api.aimlapi.com/v1/tts", headers=headers, json=payload, timeout=120)
response.raise_for_status()
print(response.json())const response = await fetch("https://api.aimlapi.com/v1/tts", {
method: "POST",
headers: {
Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
"model": "openai/gpt-4o-mini-tts",
"text": "Your order has shipped. It will arrive on Thursday between nine and eleven in the morning. Reply to this message if you need to change the delivery time."
}),
});
if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());Models similar to GPT-4o mini TTS
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GPT-4o mini TTS FAQ
What inputs and outputs does GPT-4o mini TTS support?
GPT-4o mini TTS takes text as input and returns audio.
When was GPT-4o mini TTS released?
GPT-4o mini TTS became available on January 5, 2026.
How much does GPT-4o mini TTS cost?
GPT-4o mini TTS costs $0.001 per generation on AI/ML API, billed as you go with no subscription.
Who created GPT-4o mini TTS?
GPT-4o mini TTS was built by OpenAI.
How do I call GPT-4o mini TTS on AI/ML API?
Send a request to https://api.aimlapi.com/v1/tts with openai/gpt-4o-mini-tts as the model id.
Is GPT-4o mini TTS available through a single API key?
Yes. GPT-4o mini TTS is served through AI/ML API, so the same key and endpoint format used for other models applies.
What is the maximum input length for GPT-4o mini TTS?
It accepts up to 2000 input tokens per request.
What is the GPT-4o mini TTS model ID?
Use openai/gpt-4o-mini-tts as the model parameter. Requests go to https://api.aimlapi.com/v1/tts with your AI/ML API key.