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FLUX.1 Kontext · Text to Image

Integrate

Model id flux-pro/kontext/text-to-image
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://vit.doitong.com/api/v1/run/flux-pro/kontext/text-to-image?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://vit.doitong.com/api/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"

This request: $0.04 40 API credits Run it on this page

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Black Forest Labs · Image

Your first result goes here

Build a request below and run it with your API key. Outputs are copied to our storage, kept forever or 7 days for free.

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Controls are generated from the model schema. The code and the price update as you change them.

•required

Prompt that guides image generation.

aspect_ratio default 1:1

Aspect ratio for the resulting image.

num_images default 1

Image count requested for generation.

Advanced output_format · safety_tolerance · guidance_scale · seed · enhance_prompt
output_format default jpeg

File format for the resulting image.

safety_tolerance default 2

Generated-image safety setting, ranging in tolerance from maximum permissiveness at 5 to maximum strictness at 1.

default 3.5

Prompt-adherence strength for image selection, expressed as CFG (Classifier Free Guidance).

Seed for reproducible images: an identical prompt and seed produce an identical image when the model version is unchanged.

POST /run/flux-pro/kontext/text-to-image?wait=20 quote → $0.04
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://vit.doitong.com/api/v1/run/flux-pro/kontext/text-to-image?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://vit.doitong.com/api/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"

Run this request

Your key stays in this browser: it is sent only to the Doitong API and saved (localStorage) only if you tick Remember. Get an API key

About FLUX.1 Kontext · Text to Image

Generates images purely from a `prompt`. `aspect_ratio` defaults to 1:1 and supports ratios from 21:9 to 9:21. Optional `enhance_prompt`, `guidance_scale` 1 to 20, `safety_tolerance` 1 to 6, and 1 to 4 outputs as jpeg or png.

Parameters

Send either the canonical name or the native name, not both. Canonical names

NameType DefaultAllowed Description
promptrequired
Typestring
Prompt that guides image generation.
seedoptional
Typeinteger | null
Seed for reproducible images: an identical prompt and seed produce an identical image when the model version is unchanged.
guidance_scaleoptional
Typenumber
Default3.5
1 – 20
Prompt-adherence strength for image selection, expressed as CFG (Classifier Free Guidance).
num_imagesoptional num_outputs
Typeinteger
Default1
1 – 4
Image count requested for generation.
output_formatoptional
Typeenum
Defaultjpeg
jpegpng
File format for the resulting image.
safety_toleranceoptional
Typeenum
Default2
123456
Generated-image safety setting, ranging in tolerance from maximum permissiveness at 5 to maximum strictness at 1.
enhance_promptoptional
Typeboolean
Defaultfalse
Controls prompt enhancement to improve results.
aspect_ratiooptional
Typeenum
Default1:1
21:916:94:33:21:12:33:49:169:21
Aspect ratio for the resulting image.
required Canonical name, also accepted

Output

GET /requests/req_8k2m4q7x1z9c3v5b6n0p2r4t
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "flux-pro/kontext/text-to-image",
  "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": 40,
    "usd": "0.04",
    "charged": 40,
    "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",
        "width": 1024,
        "height": 768,
        "content_type": "image/jpeg"
      }
    ],
    "timings": {},
    "seed": 42,
    "has_nsfw_concepts": [
      false
    ],
    "prompt": "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://vit.doitong.com/api/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://vit.doitong.com/api/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
Your files, your choiceEvery outputs[].url is a copy on our storage: kept forever (paid per GB-month) or 7 days for free, by your account setting or ?storage=.
Same shape on every modeltype, url, content_type, width, height and duration, for images, video and audio alike. output is the model’s own result object.
Fields of output
images
array of object {url, width, height, content_type}File information for the generated images.
timings
object
seed
integerImage-generation seed, including the randomly chosen value if the input omitted a seed; otherwise, it repeats the supplied value.
has_nsfw_concepts
array of booleanIndicates whether NSFW concepts appear in the generated images.
prompt
stringPrompt used during image generation.

More models: Image Editing

For AI agents: this page as Markdown is at https://doitong.com/developers/models/flux-pro/kontext/text-to-image.md. All models and guides: https://doitong.com/developers/llms.txt