对接 OpenAI 的图像生成模型，按 token 计费，支持流式中帧和图生图 + mask。

基础生成

curl -X POST https://51kik.com/v1/image/v1/generations \
  -H 'Authorization: Bearer sk-xxxxxxxx' \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "gpt-image-1",
    "prompt": "isometric pixel-art spaceship launching",
    "size": "1024x1024",
    "upstream_options": { "quality": "high", "output_format": "png", "background": "auto" }
  }'

计费方式

GPT Image 按 token 计费，usage 结构如下：

{
  "usage": {
    "input_tokens":  { "image_tokens": 0,    "text_tokens": 32 },
    "output_tokens": { "image_tokens": 4096, "text_tokens": 0  },
    "total_tokens": 4128
  }
}

图生图 + 编辑 mask

curl -X POST https://51kik.com/v1/image/v1/generations \
  -H 'Authorization: Bearer sk-xxxxxxxx' \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "gpt-image-1",
    "prompt": "remove the background",
    "image": "https://example.com/source.png",
    "size": "1024x1024",
    "upstream_options": { "quality": "high", "background": "transparent", "output_format": "png", "input_fidelity": "high", "mask": "https://example.com/mask.png" }
  }'

流式（中间帧）

curl -N -X POST https://51kik.com/v1/image/v1/generations \
  -H 'Authorization: Bearer sk-xxxxxxxx' \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "gpt-image-1",
    "prompt": "watercolor cathedral at golden hour",
    "size": "1024x1024",
    "stream": true,
    "upstream_options": { "partial_images": 3, "output_format": "png" }
  }'

常用 upstream_options

参数说明
quality质量：low / medium / high
output_formatpng / webp / jpeg
background背景色 / transparent
n生成张数
mask编辑遮罩 URL
partial_images流式时返回中间帧数
input_fidelity参考图保真度

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