# Native OpenAI Format

This file is the focused AI-readable context for one UniAll documentation page.

URL: https://docs.uniall.ai/models/image/nano-series/openai-format
Locale: en
Markdown: https://docs.uniall.ai/ai/pages/models/image/nano-series/openai-format.md
Description: Nano Series native OpenAI format endpoint.

Agent guidance:
- Use this page when the user is asking about this specific route or model capability.
- Preserve endpoint paths, JSON keys, model IDs, and placeholder values exactly.
- Treat examples such as `sk-***`, `{BASE_URL}`, and `task_xxx` as safe placeholders, not real secrets.

## Page Markdown

## Endpoint


```http
POST /v1/chat/completions
```
## Header Parameters

| Name | Type | Required | Description | Example |
| --- | --- | --- | --- | --- |
| `Authorization` | string | No | | Bearer {your_token} |
## Request Body Parameters

| Field | Type | Required | Title | Description |
| --- | --- | --- | --- | --- |
| `model` | string | Yes | Model name | Optional values:NanoBanana, NanoBananaPro-1K, NanoBananaPro-2K, NanoBananaPro-4K, NanoBanana2-0.5K, NanoBanana2-1K, NanoBanana2-2K, NanoBanana2-4K |
| `--aspect_ratio` | string | Yes | aspect ratio | Optional values:1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9 |
| `--output_format` | string | Yes | image type | Optional values:"jpeg", "png", "webp" |
| `messages` | array | No | Example field | Appears in a request example; no separate field description is provided. |
| `extra_body` | object | No | Example field | Appears in a request example; no separate field description is provided. |
| `stream` | boolean | No | Example field | Appears in a request example; no separate field description is provided. |

## Request Examples

###

```json
{
  "model": "NanoBananaPro-1K",
  "messages": [
    {
      "role": "user",
      "content": "a cute cat"
    }
  ],
  "extra_body": {
    "google": {
      "image_config": {
        "aspect_ratio": "16:9"
      }
    }
  },
  "stream": true
}
```

```bash
curl -X POST "{BASE_URL}/v1/chat/completions" \
 -H "Authorization: Bearer sk-***" \
 -H "Content-Type: application/json" \
 -d '{"model": "NanoBananaPro-1K",
 "messages": [{"role": "user",
 "content": "a cute cat"}],
 "extra_body": {"google": {"image_config": {"aspect_ratio": "16:9"}}},
 "stream": true}'
```
###

```json
{
  "model": "NanoBananaPro-1K",
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": ", generation, "
        },
        {
          "type": "image_url",
          "image_url": {
            "url": "https://example.com/xxxxxxx.jpg"
          }
        }
      ]
    }
  ],
  "extra_body": {
    "google": {
      "image_config": {
        "aspect_ratio": "16:9"
      }
    }
  },
  "stream": true
}
```

```bash
curl -X POST "{BASE_URL}/v1/chat/completions" \
 -H "Authorization: Bearer sk-***" \
 -H "Content-Type: application/json" \
 -d '{"model": "NanoBananaPro-1K",
 "messages": [{"role": "user",
 "content": [{"type": "text",
 "text": ", generation, "},
 {"type": "image_url",
 "image_url": {"url": "https://example.com/xxxxxxx.jpg"}}]}],
 "extra_body": {"google": {"image_config": {"aspect_ratio": "16:9"}}},
 "stream": true}'
```
## Response Fields

| Field | Type | Required | Title | Description |
| --- | --- | --- | --- | --- |


## Response Examples

### generationSuccess

```json
{
  "id": "chatcmpl_3a72451d018247b6a14adb45275c2433",
  "object": "chat.completion.chunk",
  "created": 1773835762,
  "model": "NanoBananaPro-8K",
  "choices": [
    {
      "index": 0,
      "delta": {
        "role": "assistant",
        "content": "https://xxx.xxx.cn/output/38fa5bcb-d055-40b0-9f04-5ef259c9131c-u2_307ace79-d89b-4075-9e71-8180774947c4.jpeg"
      },
      "finish_reason": "stop"
    }
  ],
  "media": {
    "outputs": [
      "https://xxx.xxx.cn/output/38fa5bcb-d055-40b0-9f04-5ef259c9131c-u2_307ace79-d89b-4075-9e71-8180774947c4.jpeg"
    ]
  }
}
```