black-forest-labs/flux-dev/image-to-image

图生图

在线试用获取 API 密钥OpenAPI llms.txt

提示词 *

Image URL *

更多设置（7 项）

生成加速

Guidance scale (CFG)

Num Images

Num Inference Steps

Output Format

随机种子

Strength

生成结果演示示例登录后试用

$0.03 / 百万像素 · 按每张图实际像素计费

示例 · 由以下输入生成

A friendly round robot gardener tending glowing blue flowers inside a glass greenhouse dome on Mars at night, under a deep sky full of stars with two small moons, cool silver moonlight on the red dunes beyond the glass, the flowers glowing brighter in the dark, cinematic digital art.

价格

单价 $0.03 / 百万像素

按每张图的实际像素计费；尺寸越大、张数越多，费用越高。1024×1024 约为 1 百万像素。

默认设置下通常约 $0.03 / 张。

每次请求会先临时冻结 $0.03，按实际用量扣费，通常在一分钟内完成：多余部分退回，超出部分从余额扣除，余额可能因此变为负数；余额为负时新请求暂停，充值后先抵扣欠款。

生成失败不收费。

API 接入

用这个模型 ID 提交生成请求。

POST/v1/model-tasks

black-forest-labs/flux-dev/image-to-image

请求体

{
  "model": "black-forest-labs/flux-dev/image-to-image",
  "input": {
    "prompt": "A friendly round robot gardener tending glowing blue flowers inside a glass greenhouse dome on Mars at night, under a deep sky full of stars with two small moons, cool silver moonlight on the red dunes beyond the glass, the flowers glowing brighter in the dark, cinematic digital art.",
    "acceleration": "none",
    "guidance_scale": 3.5,
    "image_url": "https://pub-a7287c8d5de944d984e22a5bd3ab9bbe.r2.dev/uploads/capability-demo-a79d0d058a40e3b8dae983da81fe156b.jpg",
    "num_images": 1,
    "num_inference_steps": 40,
    "output_format": "jpeg",
    "strength": 0.85
  }
}

输入 Schema

参数	类型	是否必填	默认值
image_url	string	必填	—
prompt	string	必填	—
acceleration	string	可选	none
guidance_scale	number	可选	3.5
num_images	integer	可选	1
num_inference_steps	integer	可选	40
output_format	string	可选	jpeg
seed	integer	可选	—
strength	number	可选	0.95

返回结果

接口会返回生成结果，或返回可轮询的异步任务；具体响应方式与结果字段见下方示例和 Schema。

异步任务

提交响应

HTTP 202

/v1/model-tasksapplication/json

{
  "id": "task_example",
  "model": "black-forest-labs/flux-dev/image-to-image",
  "status": "queued"
}

状态响应

HTTP 200

/v1/model-tasks/{id}application/json

{
  "id": "task_example",
  "model": "black-forest-labs/flux-dev/image-to-image",
  "status": "completed",
  "output": {
    "images": [
      {
        "url": "https://api.musespan.com/v1/model-tasks/task_example/artifacts/0"
      }
    ]
  }
}

文件下载

HTTP 200

/v1/model-tasks/{id}/artifacts/{index}生成的图片（如 image/png）

任务完成后，output 里的文件地址就指向此接口，序号从 0 开始。下载时要带上同一个 API Key（Authorization 请求头）。

错误响应

HTTP 400

/v1/model-tasksapplication/json

{
  "error": {
    "code": "invalid_input",
    "message": "The input does not match this model's input schema. Check the model's API documentation.",
    "type": "invalid_request_error"
  }
}

调用示例

异步任务提交后返回任务 ID，轮询至 status 为 completed 后，按返回结果获取生成内容。API Key 在控制台获取。

# Use a new directory for each new generation. Rerunning here continues this task.
set -eu
test -s model-task-id.txt || python3 -c "import uuid; print(uuid.uuid4())" > model-task-id.txt
REQUEST_ID=$(cat model-task-id.txt)
# Idempotent: resending the same bytes with the same ID never charges twice.
curl --fail-with-body --retry 3 --retry-connrefused --request POST 'https://api.musespan.com/v1/model-tasks' \
  --header "Authorization: Bearer $MUSESPAN_API_KEY" \
  --header "X-Request-Id: $REQUEST_ID" \
  --header "Content-Type: application/json" \
  --data '{"model":"black-forest-labs/flux-dev/image-to-image","input":{"prompt":"A friendly round robot gardener tending glowing blue flowers inside a glass greenhouse dome on Mars at night, under a deep sky full of stars with two small moons, cool silver moonlight on the red dunes beyond the glass, the flowers glowing brighter in the dark, cinematic digital art.","acceleration":"none","guidance_scale":3.5,"image_url":"https://pub-a7287c8d5de944d984e22a5bd3ab9bbe.r2.dev/uploads/capability-demo-a79d0d058a40e3b8dae983da81fe156b.jpg","num_images":1,"num_inference_steps":40,"output_format":"jpeg","strength":0.85}}'
# Poll every 5 seconds for up to 25 minutes until status is completed or failed.
# Still queued (with queue_position) 5 minutes after submission: failed with queue_timeout, not charged.
# No result 15 minutes after acceptance (or no confirmation 15 minutes after submission): failed with generation_timeout, not charged.
# Any failure is final: generate again in a new directory (a new X-Request-Id).
# A 404 means the POST did not arrive: rerun this script to resend it with the same ID.
curl --fail-with-body 'https://api.musespan.com/v1/model-tasks/'"$REQUEST_ID"'' --header "Authorization: Bearer $MUSESPAN_API_KEY"