Image Generation API

Create image tasks with Xenodia's shared image endpoint, model-specific parameters, and reference input.

Use POST /v1/images/generations to create a public image generation task. Multiple models share the same endpoint, but supported parameters and pricing can differ by model. The endpoint returns a task immediately; poll the task endpoint for the final image URL.

Endpoint

POST https://api.xenodia.xyz/v1/images/generations

Minimal request

{
  "model": "gpt-image-2",
  "prompt": "A clean product render of a translucent AI gateway cube on a white desk.",
  "response_format": "url"
}

Task request

{
  "model": "nano-banana-pro",
  "prompt": "A cinematic dashboard screenshot for a developer API product.",
  "aspect_ratio": "16:9",
  "resolution": "2K",
  "response_format": "url"
}

The request returns a task identifier. Poll it with Task Retrieval. The async field can still be sent for backward compatibility, but image generation always uses task mode.

Reference inputs

reference 対応 model は image_input URL または multipart file を受け取れます。

{
  "model": "gpt-image-2",
  "prompt": "Use this reference as the product shape, render it in a clean studio.",
  "image_input": [
    "https://example.com/reference.png"
  ],
  "response_format": "url"
}

Multipart request：

curl -X POST "https://api.xenodia.xyz/v1/images/generations" \
  -H "Authorization: Bearer $XENODIA_API_KEY" \
  -F "model=nano-banana-pro" \
  -F "prompt=Render the uploaded reference as a clean product image." \
  -F "response_format=url" \
  -F "image=@./reference.png"

Multipart fields は model、prompt、async、response_format、aspect_ratio、resolution、output_format、n、channel_id、繰り返し可能な image_input / image_input[] URL fields、image / image[] file fields です。

Responses

Image requests return a 202 task envelope:

{
  "task_id": "task_123",
  "object": "task",
  "model": "nano-banana-pro",
  "type": "image",
  "state": "waiting",
  "created_at": 1760000000,
  "poll_url": "/v1/tasks/task_123"
}

Shared rules

/v1/models で現在の model-specific limits を確認する。
discovery が明示しない限り n は 1 のままにする。
response_format: "url" を使う。base64 image response は現在未対応。
Store the returned task_id and poll poll_url until success or fail.
一時 URL の場合、生成 asset は早めに download する。