> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mixroute.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Lyria 3.5

> Google music-generation model for instrumental tracks and songs with vocals.

Google music-generation model for instrumental tracks and songs with vocals.

## Model Information

| Field      | Description                               |
| ---------- | ----------------------------------------- |
| `model`    | lyria-3.5                                 |
| `context`  | 131,072 input tokens                      |
| `endpoint` | POST /v1/models/lyria-3.5:generateContent |

Context and output sizes describe the model specification. Effective request limits, availability, and billing depend on the MixRoute route.

## Capabilities and Usage

* Accepts text and image prompts and returns audio with accompanying text when applicable. It is not a speech transcription or text-to-speech model.
* Describe genre, instruments, vocals, and desired duration in the prompt. Duration is not a fixed seconds parameter.
* Read candidates\[].content.parts\[].inlineData.data as Base64 audio and inspect inlineData.mimeType. Default audio is MP3; generated audio is 44.1 kHz stereo.

## Request Example

Set `MIXROUTE_API_KEY` before making the request.

```bash theme={null}
curl --request POST "https://api.mixroute.ai/v1/models/lyria-3.5:generateContent" \
  --header "Authorization: Bearer $MIXROUTE_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "contents": [
    {
      "role": "user",
      "parts": [
        {
          "text": "Create a short instrumental piano track. No vocals."
        }
      ]
    }
  ]
}'
```

## Request Fields

| Field              | Description                                               |
| ------------------ | --------------------------------------------------------- |
| `contents`         | Required user content with text and optional image parts. |
| `generationConfig` | Optional native Gemini generation settings.               |

Complete request format: [gemini-native](/en/api-reference/endpoint/gemini-native).