flux-3-image-klein

Name: flux-3-image-klein API
Brand: Black Forest Labs

AliasFlux 3 Image Klein

by Black Forest LabsImage

Flux 3 Image Klein API by Black Forest Labs on TTAPI supports generation, reference editing, and composition, with exact width and height, seed, output format, and 1–16 sampling steps.

ReferencesUp to 10images per request

Resolution4Khighest output tier

FlowAsyncjobId → image

Billing40% offofficial pricing

Fox train traveler — official Black Forest Labs flux-3-image-klein showcase

Fox train travelerExample 01

Moon-cat stamp — official Black Forest Labs flux-3-image-klein showcase

Moon-cat stampExample 02

Snow-leopard ledge — official Black Forest Labs flux-3-image-klein showcase

Snow-leopard ledgeExample 03

Clay lunar gardener — official Black Forest Labs flux-3-image-klein showcase

Clay lunar gardenerExample 04

Examples

Flux 3 official image examples

Adapted visual description; original generation prompt not published. Japanese woodblock-inspired coastal illustration with a lighthouse keeper and stormy weather.

Adapted visual description; original generation prompt not published. Underwater photography of a diver above a detailed coral landscape in blue water.

Adapted visual description; original generation prompt not published. A detailed wildlife portrait of a snow leopard relaxing on a rocky shelf.

Adapted visual description; original generation prompt not published. A contemporary denim portrait with warm orange studio color and natural facial detail.

Adapted visual description; original generation prompt not published. A documentary-style portrait with a golden eagle and warm evening light.

Adapted visual description; original generation prompt not published. An ornate navy-and-gold postage design featuring a white cat and a crescent moon.

Adapted visual description; original generation prompt not published. A graphic book cover combining bold red color and assertive editorial typography.

Adapted visual description; original generation prompt not published. Macro wildlife photography with a tiny jumping spider, fern textures, and water droplets.

Adapted visual description; original generation prompt not published. A whimsical travel scene with a sleeping fox curled into an old suitcase aboard a train.

Capabilities

What you can build with flux-3-image-klein

Text to image

Describe a scene and choose an explicit aspect ratio and resolution tier.

Reference editing

Pass images to edit details, restyle a scene, or combine up to 10 references.

Prompt layout boxes

Use a normalized 0–1000 coordinate grid inside the prompt to describe placement or edit regions.

Model-specific controls

Standard Image exposes grounding; Klein instead adds paired width and height, seed, jpeg/png output, and 1–16 steps.

Pricing

Per-action, in quota

Usage is metered in quota by model, action, and output settings.

Flux 3 Image Klein generation and editingOfficial pricing

ModelTTAPI billingUnit

flux-3-image-klein40% off official/ image

API request

Headers and submit parameters

Use the endpoint below with your TTAPI key and the request fields shown.

GeneratePOST

/bfl/v1/flux-3-image-klein

Create, edit, or combine images in an asynchronous Flux 3 task.

Official reference

FetchGET

/flux/fetch

Read task status and retrieve the generated image using jobId.

Official reference

POSThttps://api.ttapi.io/bfl/v1/flux-3-image-klein

Headers

TT-API-KEYstringrequired

Your TTAPI API key.

Content-Typestringrequired

Use application/json.

Body

promptstringrequired

Describe a new image or an edit. Refer to inputs in order as image 1, image 2, and so on. Optional layout boxes use a 0–1000 [top, left, bottom, right] grid in the prompt.

imagesstring | string[]optional

Omit for text-to-image; supply 1–10 HTTP(S) URLs or base64 images to edit, restyle, or combine them. The first image is the edited image and sets the default output size.

aspect_ratioenumoptional

The same explicit ratios as FLUX 3 Image, or auto (default). Auto follows the first input's exact ratio or the prompt; text-only fallback is 16:9. Ignored when width and height are both set.

resolutionenumoptional

768sq, 1k, 1.5k, 2k, or 4k. Omitted text-only requests use 1k; edits retain the first image's size or nearest tier if aspect_ratio is set. Ignored when width and height are both set.

safety_toleranceintegeroptional

0–7, default 2; lower values are stricter. The approved maximum depends on the route and organization.

webhook_urlstringoptional

Callback URL for the asynchronous task. The submission returns jobId; use the callback or Flux Fetch to get the image.

widthintegerconditional

64–6256 pixels, supplied with height. Together they override aspect_ratio and resolution; total area must not exceed 16,822,272 pixels.

heightintegerconditional

64–6256 pixels, supplied with width. The width × height limit is 16,822,272 pixels.

seedintegeroptional

0–4294967295; random when omitted.

output_formatenumoptional

jpeg (default) or png.

stepsintegeroptional

Denoising steps from 1 to 16; defaults to 16.

Open the official TTAPI documentation

Integrate

From key to first result

Copy the resolved endpoint, authentication headers, and request body for this model.

curl --request POST \
  --url https://api.ttapi.io/bfl/v1/flux-3-image-klein \
  --header 'TT-API-KEY: $TTAPI_KEY' \
  --header 'Content-Type: application/json' \
  --data '{"prompt":"Editorial photograph of a ceramic tea set on a linen table, soft daylight and realistic textures.","aspect_ratio":"3:4","resolution":"1k","output_format":"jpeg","steps":16}'