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

# Gemini Audio Understanding

> Gemini native audio understanding documented from successful Crazyrouter request patterns on 2026-04-08

> Last updated: 2026-06-06

# Gemini Audio Understanding

```text theme={null}
POST /v1beta/models/{model}:generateContent
```

As of `2026-04-08`, successful Crazyrouter and local `:4000` retests show:

* `gemini-3.1-pro` can read `audio/wav`
* the currently verified primary path is `inlineData`
* short audio classification, transcription, language hints, and summaries can be requested directly in text

***

## Verified Minimal Request

```bash theme={null}
curl "https://api.crazyrouter.com/v1beta/models/gemini-3.1-pro:generateContent?key=YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {
            "inlineData": {
              "mimeType": "audio/wav",
              "data": "BASE64_WAV_DATA"
            }
          },
          {
            "text": "Return JSON with transcript, language, and summary."
          }
        ]
      }
    ],
    "generationConfig": {
      "maxOutputTokens": 512
    }
  }'
```

Observed successful response shape:

````json theme={null}
{
  "candidates": [
    {
      "content": {
        "parts": [
          {
            "text": "```json\n{\n  \"transcript\": \"ding\",\n  \"language\": \"zh-CN\",\n  \"summary\": \"The audio contains one short notification sound.\"\n}\n```"
          }
        ]
      }
    }
  ]
}
````

## Request Notes

* Prefer `inlineData` for audio understanding
* Keep `mimeType` aligned with the actual format, such as `audio/wav` or `audio/mpeg`
* Put raw Base64 into `data` without a Data URL prefix
* If you need strict JSON instead of JSON-looking text, combine this route with [Structured Outputs](/en/features/structured-outputs)

<Note>
  This page only covers the short-audio understanding path that was actually rechecked successfully. For longer STT workflows or TTS, see the existing [STT](/en/audio/stt) and [TTS](/en/audio/tts) pages; Realtime is not currently shown as a public recommended example.
</Note>