> ## 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 Image Understanding

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

> Дата обновления: 2026-06-06

# Gemini Image Understanding

```
POST /v1beta/models/{model}:generateContent
```

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

* `gemini-2.5-pro` can reliably read images through `inlineData`
* remote image URLs through `fileData.fileUri` have shown repeated fetch and upstream-body failures
* the primary recommended request shape for image understanding is therefore `inlineData`

***

## Verified Minimal Request

```bash theme={null}
curl "https://api.crazyrouter.com/v1beta/models/gemini-2.5-pro:generateContent?key=YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {
            "inlineData": {
              "mimeType": "image/png",
              "data": "BASE64_PNG_DATA"
            }
          },
          {
            "text": "Describe this image in one short sentence."
          }
        ]
      }
    ]
  }'
```

Observed production response shape:

```json theme={null}
{
  "candidates": [
    {
      "content": {
        "parts": [
          {
            "text": "This image shows a smooth multi-color gradient background."
          }
        ]
      }
    }
  ]
}
```

## Request Notes

* Prefer `inlineData` for image understanding
* Keep `mimeType` aligned with the actual file format, such as `image/png` or `image/jpeg`
* Put raw Base64 into `data` without the `data:image/...;base64,` prefix
* If you only have a remote image URL, do not treat it as the current primary Gemini image-understanding path on Crazyrouter

<Note>
  For video understanding, see [Gemini Video Understanding](/ru/chat/gemini/video). For audio understanding, see [Gemini Audio Understanding](/ru/chat/gemini/audio).
</Note>