GPT-4o mini TTS API

openai/gpt-4o-mini-tts
GPT-4o-mini-TTS leverages the GPT-4o mini transformer-based architecture, optimized for speech synthesis.
Output
Released
Jan 5, 2026

How to use GPT-4o mini TTS API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to openai/gpt-4o-mini-tts.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/tts",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "openai/gpt-4o-mini-tts",
      "text": "Hello from AI/ML API",
      "voice": "alloy"
    },
)
print(r.json()["audio"])  # URL to the generated audio
const r = 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": "Hello from AI/ML API",
    "voice": "alloy"
  }),
});
const { audio } = await r.json();
console.log(audio); // URL to the generated audio
curl -X POST https://api.aimlapi.com/v1/tts \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-4o-mini-tts","text":"Hello from AI/ML API","voice":"alloy"}'

# the JSON response contains "audio" — a URL to the generated speech

OpenAI-compatible — swap the base URL and it works with your existing SDK.

GPT-4o mini TTS API Pricing

TypePrice
Input
$0.78 / 1M characters
Output

GPT-4o mini TTS vs other models

ModelInputOutputContextBest for
$0.78 / 1M characters
Speech synthesis
$130 / 1M characters
$130 / 1M
Speech synthesis
$130 / 1M characters
$0.13 / 1M tokens
Speech synthesis
$78 / 1M characters
$0.078 / 1M tokens
Speech synthesis
$13 / 1M characters
$0.013 / 1M tokens
Speech synthesis

Frequently asked questions

GPT-4o mini TTS takes text as input and returns audio.

GPT-4o mini TTS became available on January 5, 2026.

GPT-4o mini TTS is priced at input $0.78 / 1M characters.

GPT-4o mini TTS was built by OpenAI.

Send a request to https://api.aimlapi.com/v1/tts with openai/gpt-4o-mini-tts as the model id.

Yes. GPT-4o mini TTS is served through AI/ML API, so the same key and endpoint format used for other models applies.

It accepts up to 2000 input tokens per request.

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