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Model blf_flux ​

  • 2026.01.21 Now supports flux-2-klein-4b and flux-2-klein-9b
  • 2025.12.01 Now supports flux-2-max
  • 2025.11.26 Now supports flux-2-pro and flux-2-flex
  • 2025.06.09 This site now supports flux-related models from bfl.ai
  • Supported models include flux-kontext-max flux-kontext-pro flux-pro-1.1-ultra flux-pro-1.1 flux-pro flux-dev and more

Pricing and Billing ​

  • Prices are based on bfl.ai exchange rate of 4
  • Oct 21: Due to account risk control issues at bfl, prices increased to a 1:4 exchange rate at 23:00
  • Example: official flux-dev is $0.025/image, this site charges ¥0.075/image, which equals 750 credits/image
  • Official pricing table: https://bfl.ai/pricing

flux-2 Billing Notes ​

  • The response will include a cost field
  • 1 cost = $0.01, multiply by the exchange rate to get credits in CNY
  • flux-2-pro starts from 3cost, flux-2-flex starts from 6cost
  • Billing is related to the size of input and output images
json
{
  "id": "2fa25140-591f-4839-b377-9945a7a3881a",
  "polling_url": "https://api.eu2.bfl.ai/v1/get_result?id=2fa25140-591f-4839-b377-9945a7a3881a",
  "cost": 4.5, //this is used for billing
  "input_mp": 0,
  "output_mp": 1.98
}
{
  "id": "2fa25140-591f-4839-b377-9945a7a3881a",
  "polling_url": "https://api.eu2.bfl.ai/v1/get_result?id=2fa25140-591f-4839-b377-9945a7a3881a",
  "cost": 4.5, //this is used for billing
  "input_mp": 0,
  "output_mp": 1.98
}

BFL_Flux API ​

  • Use Authorization: Bearer your-key in the header (the official site uses x-key)
  • Replace the official https://api.bfl.ai/v1 with https://api.openai-hk.com/bfl/v1
  • Official help documentation reference

1. Create a Task ​

post https://api.openai-hk.com/bfl/v1/{model}

shell
curl --request POST \
  --url https://api.openai-hk.com/bfl/v1/flux-dev \
  --header 'Authorization: Bearer hk-your-key' \
  --header 'Content-Type: application/json' \
  --data '{
  "prompt": "Elephant fights tiger",
  "width": 1024,
  "height": 768,
  "steps": 28,
  "prompt_upsampling": false,
  "seed": 42,
  "guidance": 3,
  "safety_tolerance": 2,
  "output_format": "jpeg"
}'
curl --request POST \
  --url https://api.openai-hk.com/bfl/v1/flux-dev \
  --header 'Authorization: Bearer hk-your-key' \
  --header 'Content-Type: application/json' \
  --data '{
  "prompt": "Elephant fights tiger",
  "width": 1024,
  "height": 768,
  "steps": 28,
  "prompt_upsampling": false,
  "seed": 42,
  "guidance": 3,
  "safety_tolerance": 2,
  "output_format": "jpeg"
}'

Response body

json
{
  "id": "9dd30d68-4995-4c7b-97e5-9d1943bfc727"
}
{
  "id": "9dd30d68-4995-4c7b-97e5-9d1943bfc727"
}

The returned id is the task_id to be used in the next step to retrieve the task result.

2. Retrieve a Task ​

get https://api.openai-hk.com/bfl/v1/get_result?id={task_id}

shell
curl --request GET \
  --url 'https://api.openai-hk.com/bfl/v1/get_result?id=f5295e95-191c-4fcd-abfb-236e67226f60' \
  --header 'Authorization: Bearer hk-your-key' \
  --header 'Content-Type: application/json'
curl --request GET \
  --url 'https://api.openai-hk.com/bfl/v1/get_result?id=f5295e95-191c-4fcd-abfb-236e67226f60' \
  --header 'Authorization: Bearer hk-your-key' \
  --header 'Content-Type: application/json'

Response body

json
{
  "id": "f5295e95-191c-4fcd-abfb-236e67226f60",
  "status": "Ready",
  "result": {
    "sample": "https://delivery-us1.bfl.ai/results/9a/99533669e7979a/69e7979af22842ca9e28a0434285868d/sample.jpeg?se=2025-06-09T14%3A16%3A35Z&sp=r&sv=2024-11-04&sr=b&rsct=image/jpeg&sig=Sk6Gg/sYyC/8ntQzyJaSG6KGZT%2B7HtMz9NyQy1l0608%3D",
    "prompt": "Elephant fights tiger",
    "seed": 42,
    "start_time": 1749477991.4603546,
    "end_time": 1749477995.6950064,
    "duration": 4.234651803970337
  },
  "progress": null,
  "details": null
}
{
  "id": "f5295e95-191c-4fcd-abfb-236e67226f60",
  "status": "Ready",
  "result": {
    "sample": "https://delivery-us1.bfl.ai/results/9a/99533669e7979a/69e7979af22842ca9e28a0434285868d/sample.jpeg?se=2025-06-09T14%3A16%3A35Z&sp=r&sv=2024-11-04&sr=b&rsct=image/jpeg&sig=Sk6Gg/sYyC/8ntQzyJaSG6KGZT%2B7HtMz9NyQy1l0608%3D",
    "prompt": "Elephant fights tiger",
    "seed": 42,
    "start_time": 1749477991.4603546,
    "end_time": 1749477995.6950064,
    "duration": 4.234651803970337
  },
  "progress": null,
  "details": null
}
  • If status is Ready, the image URL is available in result.sample
  • Note: the image URL in result.sample has a time limit and will expire

3. Width/Height Ranges ​

ModelRange
flux-2-flexWidth/height x >= 64, must be a multiple of 32
flux-2-proWidth/height x >= 64, must be a multiple of 32
flux-2-maxWidth/height x >= 64, must be a multiple of 32
flux-pro-1.1Width/height 256 <= x <= 1440, must be a multiple of 32
flux-devWidth/height 256 <= x <= 1440, must be a multiple of 32
flux-pro-1.1-ultraDoes not support width/height, supports aspect ratio
flux-kontext-proDoes not support width/height, supports aspect ratio
flux-kontext-maxDoes not support width/height, supports aspect ratio
  • Reference aspect ratios: "1:1", "16:9", "21:9", "3:2", "2:3", "4:5", "5:4", "3:4", "4:3", "9:16", "9:21"
  • flux-2 supports custom width/height, but note that billing is tied to the dimensions