About
GPT-4o mini TTS is a text-to-speech model built on GPT-4o mini, a fast and powerful language model.
Use it to convert text to natural sounding spoken text.
1. Calling the API
Setup your API Key
To begin using Infron, you first need to create an account and generate your API Key.
Once you have your API key, set it as an environment variable in your runtime environment. This allows your applications to securely access Infron’s API.
export INFRON_KEY="YOUR_API_KEY"Submit a request
For long-running requests, you can poll for results.
curl https://media.onerouter.pro/v1/audios/generations \
-H 'Authorization: Bearer YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"model": "openai/gpt-4o-mini-tts/text-to-audio",
"input": "Today is a wonderful day to build with Infron.",
"voice": "alloy",
"instructions": "esse incididunt",
"response_format": "mp3",
"speed": 1,
"stream_format": "audio"
}'Response with queue task id
The response will look like this:
{
"code": 200,
"message": "success",
"data": {
"task_id": "f6c274b21ca3472c987e5f6383f3fa7b",
"object": "audio",
"model": "openai/gpt-4o-mini-tts/text-to-audio",
"status": "created",
"urls": {
"query": "https://media.onerouter.pro/v1/audios/tasks/f6c274b21ca3472c987e5f6383f3fa7b"
},
"created_at": "2026-05-31 00:30:30.31"
}
}Fetch request status
You can fetch the status of a request to check if it is completed or still in progress.
curl https://media.onerouter.pro/v1/audios/tasks/{task_id} \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json"
# For example
curl https://media.onerouter.pro/v1/audios/tasks/f6c274b21ca3472c987e5f6383f3fa7b \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json"Response with queue task status query
{
"code": 200,
"message": "success",
"data": {
"task_id": "f6c274b21ca3472c987e5f6383f3fa7b",
"object": "audio",
"model": "openai/gpt-4o-mini-tts/text-to-audio",
"status": "in_progress",
"fail_reason": "",
"submit_time": 1780187430,
"start_time": 1780187430,
"finish_time": 0,
"outputs": [],
"created_at": "2026-05-31 00:30:30"
}
}Possible statuses:
- created
- in_progress
- processing
- completed
- failed
created -> in_progress → processing → completed | failed
Poll every 1-2 seconds until status is "completed" or "failed"
Get the result (when status is "completed")
Once the request is completed, you can fetch the result. See the Output Schema for the expected result format.
{
"code": 200,
"message": "success",
"data": {
"task_id": "f6c274b21ca3472c987e5f6383f3fa7b",
"object": "audio",
"model": "openai/gpt-4o-mini-tts/text-to-audio",
"status": "completed",
"fail_reason": "",
"submit_time": 1780187430,
"start_time": 1780187430,
"finish_time": 1780187443,
"outputs": [
"https://storage.googleapis.com/infron_gcs/image%2Faudio_v2%2Foutput%2Ff6c274b21ca3472c987e5f6383f3fa7b_fbd5c084.mp3"
],
"usage": {
"completion_tokens": 0,
"output_count": 1,
"prompt_tokens": 46,
"total_tokens": 46
},
"cost": {
"total_cost": 2.8e-05,
"cost_details": {
"prompt_cost": 0,
"completion_cost": 0,
"image_cost": 0,
"video_cost": 0,
"audio_cost": 2.8e-05,
"native_web_search_cost": 0,
"plugin_web_search_cost": 0,
"tools_cost": 0,
"prompt_cache_read_cost": 0,
"prompt_cache_write_cost": 0,
"prompt_cache_write_5_min": 0,
"prompt_cache_write_1_h": 0,
"reasoning_cost": 0,
"discount_rate": 1,
"is_byok": false,
"byok_cost": 0
}
},
"created_at": "2026-05-31 00:30:30"
}
}2. Schema
Input
| Parameter | Type | Required | Default | Range | Description |
|---|---|---|---|---|---|
| model | string | Yes | -- | Explore all models | Model name. |
| input | string | Yes | -- | -- | The text to generate audio for. |
| voice | string | Yes | alloy | alloy, ash, ballad, coral, echo, fable, onyx, nova, sage, shimmer, verse | URL of the video to extend. |
| instructions | string | No | -- | -- | Control the voice of your generated audio with additional instructions. |
| response_format | string | No | mp3 | mp3, opus, aac, flac, wav, pcm | Format of the generated audio. |
| speed | number | No | 1 | >=0.25 and <=4.0 | The speed of the generated audio. Select a value from 0.25 to 4.0. |
| stream_format | string | No | audio | audio, sse | The format to stream the audio. |
Example request
curl https://media.onerouter.pro/v1/audios/generations \
-H 'Authorization: Bearer YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"model": "openai/gpt-4o-mini-tts/text-to-audio",
"input": "Today is a wonderful day to build with Infron.",
"voice": "alloy",
"instructions": "esse incididunt",
"response_format": "mp3",
"speed": 1,
"stream_format": "audio"
}'Output
| Parameter | Type | Range | Description |
|---|---|---|---|
| code | integer | -- | Status code of the request. |
| message | string | -- | Status message of the request. |
| data | object | -- | Data of the task. |
| data.task_id | string | -- | ID of the task. |
| data.object | string | -- | Object type of the task. |
| data.model | string | -- | Model name of the task. |
| data.status | string | created, in_progress, processing, completed, failed | Status of the task. |
| data.fail_reason | string | -- | Fail reason of the task. |
| data.submit_time | integer | -- | Timestamp of the task submission. |
| data.start_time | integer | -- | Timestamp of the task start. |
| data.finish_time | integer | -- | Timestamp of the task finish. |
| data.outputs | array | -- | Outputs of the task. |
| data.created_at | string | -- | Timestamp of the task creation. |
Example output
{
"code": 200,
"message": "success",
"data": {
"task_id": "f6c274b21ca3472c987e5f6383f3fa7b",
"object": "audio",
"model": "openai/gpt-4o-mini-tts/text-to-audio",
"status": "completed",
"fail_reason": "",
"submit_time": 1780187430,
"start_time": 1780187430,
"finish_time": 1780187443,
"outputs": [
"https://storage.googleapis.com/infron_gcs/image%2Faudio_v2%2Foutput%2Ff6c274b21ca3472c987e5f6383f3fa7b_fbd5c084.mp3"
],
"usage": {
"completion_tokens": 0,
"output_count": 1,
"prompt_tokens": 46,
"total_tokens": 46
},
"cost": {
"total_cost": 2.8e-05,
"cost_details": {
"prompt_cost": 0,
"completion_cost": 0,
"image_cost": 0,
"video_cost": 0,
"audio_cost": 2.8e-05,
"native_web_search_cost": 0,
"plugin_web_search_cost": 0,
"tools_cost": 0,
"prompt_cache_read_cost": 0,
"prompt_cache_write_cost": 0,
"prompt_cache_write_5_min": 0,
"prompt_cache_write_1_h": 0,
"reasoning_cost": 0,
"discount_rate": 1,
"is_byok": false,
"byok_cost": 0
}
},
"created_at": "2026-05-31 00:30:30"
}
}3. Detailed Pricing
| Pricing Type | Unit | Price |
|---|---|---|
| Input text | 1M tokens | $0.60 |
| Output audio | 1M characters | $12.00 |