# Transcribe an uploaded audio file

`POST /v1/audio/transcriptions`



Base URL: `https://api.simplellm.eu`. Authenticate using `Authorization: Bearer $SIMPLELLM_API_KEY`.

## Request body

Content-Type: `multipart/form-data`

| Field | Type | Required | Meaning |
| --- | --- | --- | --- |
| `file` | `string` | Yes |  |
| `model` | `string` | No | Use whisper-large-v3 or whisper-large-v3-turbo. The compatibility alias whisper-1 maps to whisper-large-v3-turbo and is also the default; it is not a separate model. Default: `"whisper-1"`. Values: `whisper-1`, `whisper-large-v3`, `whisper-large-v3-turbo`. |
| `language` | `string` | No |  |
| `prompt` | `string` | No |  |
| `response_format` | `string` | No |  |
| `temperature` | `number` | No |  |

Nested required fields are required only when their containing object is supplied. Extra chat parameters may be provider-specific; acceptance does not guarantee model support.

## Example request

~~~bash
curl --fail-with-body https://api.simplellm.eu/v1/audio/transcriptions \
  -H "Authorization: Bearer $SIMPLELLM_API_KEY" \
  -F 'file=@recording.wav' \
  -F 'model=whisper-large-v3-turbo' \
  -F 'language=en'
~~~

## Responses

### HTTP 200

Transcription in the requested upstream-supported format.

Content-Type: `application/json`

| Field | Type | Required | Meaning |
| --- | --- | --- | --- |
| `text` | `string` | No |  |

Illustrative response shape only; IDs, timestamps and counters below are synthetic, not live limits or customer data.

~~~json
{
  "text": "example"
}
~~~

Content-Type: `text/plain`

Response type: `string`.

Content-Type: `text/vtt`

Response type: `string`.

## Error handling

Errors can occur in authentication, billing, routing or the upstream service; not every status applies to every route.

| Status | Meaning |
| --- | --- |
| 400 | Invalid request |
| 401 | Invalid credentials |
| 402 | Insufficient credits |
| 403 | Access denied |
| 404 | Model or resource not found |
| 429 | Rate or capacity limit |
| 500 | Internal error |
| 502 | Routing or upstream error |
| 503 | Temporarily unavailable |
| 504 | Deployment timeout |

See [Troubleshooting](/docs/errors.html) for response examples and [Rate limits & retries](/docs/limits.html) for retry rules.

## Machine-readable schema

[Download OpenAPI JSON](/openapi.json). Operation ID: `createTranscription`.