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Train Flux LoRA

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Model id flux-lora-fast-training
# 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-lora-fast-training?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "images_data_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  }'

# 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"

Files like the example: $2.00 2,000 API credits your files are measured before the run Run it on this page

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Black Forest Labs Training Fast #lora#personalization

Trains a Flux LoRA on a zip of your images to learn a person, subject or style

Black Forest Labs · File

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.

Build a request

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

•required

Provide images through a ZIP archive URL, optionally pairing each image with a caption text file of the same name. Aim for at least 4 images; larger image sets are generally better.

Training step count for the LoRA.

Advanced trigger_word · data_archive_format · create_masks · is_style · is_input_format_already_preprocessed

Supply a trigger word as a caption substitute when captions are missing; existing captions prevent trigger_word from being used. Set it to None to use no trigger word.

Archive format, inferred from its URL when omitted.

POST /run/flux-lora-fast-training?wait=20 quote → $2.00
# 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-lora-fast-training?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "images_data_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  }'

# 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 Train Flux LoRA

Fine-tunes a LoRA from a zip archive of images (`images_data_url`), which may include matching caption text files. Use `trigger_word` to name the concept, and `is_style` for style training, which turns off segmentation and captioning. `create_masks` weights the loss toward subjects, and `steps` accepts 1 to 10000. Returns the diffusers LoRA weights plus a config file.

Parameters

NameType DefaultAllowed Description
images_data_urlrequired
Typestring
Provide images through a ZIP archive URL, optionally pairing each image with a caption text file of the same name. Aim for at least 4 images; larger image sets are generally better.
trigger_wordoptional
Typestring | null
Supply a trigger word as a caption substitute when captions are missing; existing captions prevent trigger_word from being used. Set it to None to use no trigger word.
create_masksoptional
Typeboolean
Defaulttrue
Enable mask-based weighting of the training loss with True; for images of people, this uses a face mask whenever possible.
stepsoptional
Typeinteger | null
1 – 10,000
Training step count for the LoRA.
is_styleoptional
Typeboolean
Defaultfalse
Enable style training with True and specify the style through the trigger word. In this mode, the trigger word replaces captioning, and segmentation is disabled.
is_input_format_already_preprocessedoptional
Typeboolean
Defaultfalse
Preprocessing status of the supplied data: True indicates an already preprocessed dataset. The default, False, instead requires raw image/caption pairs with matching base names, such as 'photo.jpg' and 'photo.txt'.
data_archive_formatoptional
Typestring | null
Archive format, inferred from its URL when omitted.
required

Output

GET /requests/req_8k2m4q7x1z9c3v5b6n0p2r4t
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "flux-lora-fast-training",
  "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": 2000,
    "usd": "2.00",
    "charged": 2000,
    "refunded": 0
  },
  "input": {
    "images_data_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  },
  "output": {
    "diffusers_lora_file": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "config_file": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "debug_preprocessed_output": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    }
  },
  "outputs": [
    {
      "type": "file",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_size": 1843200,
      "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
diffusers_lora_file
object {url, content_type, file_name, file_size}URL pointing to the trained LoRA weights in diffusers format.
config_file
object {url, content_type, file_name, file_size}Training configuration file URL.
debug_preprocessed_output
object {url, content_type, file_name, file_size} | nullURL locating the images after preprocessing.

For AI agents: this page as Markdown is at https://doitong.com/developers/models/flux-lora-fast-training.md. All models and guides: https://doitong.com/developers/llms.txt