# Gemini 3.1 Flash Image Preview API

> Gemini 3.1 Flash Image text-to-image dengan output 0.5K hingga 4K, rasio ekstrem, pencarian web, dan thinking

Menghasilkan gambar dari `prompt`, dengan `resolution` 0.5K, 1K, 2K, atau 4K dan rasio aspek termasuk rasio ekstrem seperti 8:1 dan 1:8. `system_prompt`, `enable_web_search`, dan `thinking_level` (minimal atau high) opsional dapat mengatur pembuatan. Menghasilkan 1 hingga 4 gambar dalam PNG, JPEG, atau WebP.

- Model id: `gemini-3.1-flash-image-preview`
- Made by: Google
- Category: Text to Image
- Output: image
- Price: from $0.06 / image (cheapest run $0.06 (60 API credits))
- Run: `POST https://api.doitong.com/v1/run/gemini-3.1-flash-image-preview`
- Quote: `POST https://api.doitong.com/v1/quote/gemini-3.1-flash-image-preview`
- Docs page: https://doitong.com/id/developers/models/gemini-3.1-flash-image-preview

## Pricing

Price: **from $0.06 / image** (the lowest tier; the quote prices your exact input). Billed per generated image (`num_images`, default 1).

Price rules (the first rule that matches the input wins; a parameter you leave out counts as its default):

- When `enable_web_search` = true and `resolution` = 0.5K: $0.075 (75 API credits) / image
- When `resolution` = 0.5K: $0.06 (60 API credits) / image
- When `enable_web_search` = true and `resolution` = 1K: $0.095 (95 API credits) / image
- When `resolution` = 1K: $0.08 (80 API credits) / image
- When `enable_web_search` = true and `resolution` = 2K: $0.135 (135 API credits) / image
- When `resolution` = 2K: $0.12 (120 API credits) / image
- When `enable_web_search` = true and `resolution` = 4K: $0.175 (175 API credits) / image
- When `resolution` = 4K: $0.16 (160 API credits) / image

The full example input below costs $0.08 = 80 API credits (1 image × 80 API credits).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.com/v1/quote/gemini-3.1-flash-image-preview` with the same JSON body returns the exact price for that input; the quote is exactly what a run charges. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

Send either the canonical name or the native field name (not both). Canonical names are the same across models.

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `prompt` |  | string | yes |  | 3 – 50000 characters | Instruksi teks yang digunakan untuk membuat gambar. |
| `num_images` | `num_outputs` | integer | no | `1` | 1 – 4 | Jumlah gambar yang diminta untuk dibuat. |
| `seed` |  | integer \| null | no |  |  | Nilai seed yang menginisialisasi pembuatan angka acak. |
| `aspect_ratio` |  | enum (string) \| null | no | `auto` | `auto`, `21:9`, `16:9`, `3:2`, `4:3`, `5:4`, `1:1`, `4:5`, `3:4`, `2:3`, `9:16`, `4:1`, `1:4`, `8:1`, `1:8` | Pilih rasio aspek gambar yang dibuat secara eksplisit, termasuk opsi ekstrem 4:1, 1:4, 8:1, 1:8, atau pilih "auto" agar model memilih berdasarkan prompt. |
| `output_format` |  | enum (string) | no | `png` | `jpeg`, `png`, `webp` | Format file untuk gambar hasil. |
| `safety_tolerance` |  | enum (string) | no | `4` | `1`, `2`, `3`, `4`, `5`, `6` | Atur toleransi moderasi konten antara tingkat paling tidak ketat, 6, dan tingkat paling ketat, 1, yang memblokir sebagian besar konten. |
| `system_prompt` |  | string | no | `` | ≤ 50000 characters | Panduan persona dan gaya output opsional untuk seluruh permintaan, dikirim ke Gemini sebagai instruksi sistem atau ke penyedia yang kompatibel dengan OpenAI sebagai pesan sistem. Tidak ada yang dikirim untuk instruksi ini jika nilainya kosong. |
| `resolution` |  | enum (string) | no | `1K` | `0.5K`, `1K`, `2K`, `4K` | Resolusi gambar output. |
| `limit_generations` |  | boolean | no | `true` |  | Batas pembuatan eksperimental yang dapat memengaruhi kualitas saat diaktifkan. Dengan `True`, setiap putaran prompting dibatasi menjadi 1 pembuatan, mengganti instruksi jumlah gambar dalam prompt dan mengabaikan gambar antara yang dibuat model. |
| `enable_web_search` |  | boolean | no | `false` |  | Sakelar pencarian web untuk pembuatan gambar, yang memungkinkan model memasukkan informasi terbaru dari internet ke dalam gambar. |
| `thinking_level` |  | enum (string) \| null | no |  | `minimal`, `high` | Pilih 'minimal' atau 'high' untuk mengaktifkan pemikiran model pada tingkat tersebut dan menyertakan pemikirannya dalam pembuatan; jika tingkat tidak disetel, pemikiran tetap dinonaktifkan. |

## Example input

Required parameters only:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
}
```

A fuller example:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
}
```

## Run it

Set `DOITONG_API_KEY` to a key from https://doitong.com/developers/dashboard#keys. `?wait=20` returns the finished request in the same call when it is ready within 20 seconds; otherwise poll `GET /requests/{id}` (it also accepts `?wait=`), or pass `webhook_url`.

### curl

```bash
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.com/v1/run/gemini-3.1-flash-image-preview?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.com/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.com/v1";
const headers = {
  "Authorization": "Bearer " + process.env.DOITONG_API_KEY,
  "Content-Type": "application/json",
};

// Run the model; wait up to 20 s for the finished result in the same call
let res = await fetch(API + "/run/gemini-3.1-flash-image-preview?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  }),
});
let request = await res.json();
if (!res.ok) throw new Error(request.error.code + ": " + request.error.message);

// Not finished yet: long-poll until it is
while (request.status === "queued" || request.status === "running") {
  res = await fetch(API + "/requests/" + request.id + "?wait=20", { headers });
  request = await res.json();
}
if (request.status !== "succeeded") throw new Error(JSON.stringify(request.error));
console.log(request.outputs.map((o) => o.url), request.cost.credits + " API credits ($" + request.cost.usd + ")");
```

### Python

```python
import os
import requests

API = "https://api.doitong.com/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/gemini-3.1-flash-image-preview", params={"wait": 20}, json=payload, headers=headers)
request = r.json()
if not r.ok:
    raise RuntimeError(request["error"]["code"] + ": " + request["error"]["message"])

# Not finished yet: long-poll until it is
while request["status"] in ("queued", "running"):
    request = requests.get(API + "/requests/" + request["id"], params={"wait": 20}, headers=headers).json()
if request["status"] != "succeeded":
    raise RuntimeError(request["error"])
print([o["url"] for o in request["outputs"]], request["cost"]["credits"], "API credits", "$" + request["cost"]["usd"])
```

### MCP

The MCP server at `https://api.doitong.com/v1/mcp` exposes the tools `search_models`, `get_model`, `quote`, `run`, `get_request`, `cancel_request`, `list_requests`, `create_upload` and `get_account`. A `run` call for this model:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run",
    "arguments": {
      "model_id": "gemini-3.1-flash-image-preview",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
      },
      "wait_seconds": 20
    }
  }
}
```

## Response

Every call returns a request object. `status` is one of `queued`, `running`, `succeeded`, `failed`, `canceled`. `outputs` lists the generated files with URLs on our storage (kept forever, or 7 days with `?storage=temporary`; `storage` says which); `output` is the model's own result object with the same URLs.

```json
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "gemini-3.1-flash-image-preview",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 80,
    "usd": "0.08",
    "charged": 80,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  },
  "output": {
    "images": [
      {
        "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
        "content_type": "image/jpeg",
        "file_name": "0-output.jpeg",
        "file_size": 1843200,
        "width": 1024,
        "height": 768
      }
    ],
    "description": "string"
  },
  "outputs": [
    {
      "type": "image",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_size": 1843200,
      "width": 1024,
      "height": 768,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `images` | array of object {url, content_type, file_name, file_size, width, height} | Gambar yang dihasilkan oleh model. |
| `description` | string | Deskripsi yang menyertai gambar yang dibuat. |

## Related models

- [Gemini 3.1 Flash Image Preview · Edit](https://doitong.com/developers/models/gemini-3.1-flash-image-preview/edit.md) (`gemini-3.1-flash-image-preview/edit`): from $0.06 / image
- [Nano Banana 2](https://doitong.com/developers/models/nano-banana-2.md) (`nano-banana-2`): from $0.06 / image
- [Nano Banana Pro](https://doitong.com/developers/models/nano-banana-pro.md) (`nano-banana-pro`): from $0.15 / image
- [FLUX.1 \[dev\]](https://doitong.com/developers/models/flux/dev.md) (`flux/dev`): $0.025 / megapixel
- [FLUX.1 \[schnell\]](https://doitong.com/developers/models/flux/schnell.md) (`flux/schnell`): $0.003 / megapixel
- [FLUX.2 \[dev\]](https://doitong.com/developers/models/flux-2.md) (`flux-2`): $0.012 / megapixel
- [FLUX.2 \[pro\]](https://doitong.com/developers/models/flux-2-pro.md) (`flux-2-pro`): $0.015 / megapixel of output image
- [GPT Image 2.5 Text to Image](https://doitong.com/developers/models/openai/gpt-image-2.5/flare/text-to-image.md) (`openai/gpt-image-2.5/flare/text-to-image`): from $0.008 / image

## Links

- HTML page: https://doitong.com/developers/models/gemini-3.1-flash-image-preview
- All models and guides for AI agents: https://doitong.com/developers/llms.txt
- OpenAPI 3.1 with this model's typed request body: https://doitong.com/developers/openapi.json?model=gemini-3.1-flash-image-preview
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/gemini-3.1-flash-image-preview