Black Forest Labs image model

FLUX 3 Image Klein. Fast, low-cost stills and edits.

The open-weights member of the FLUX 3 family. Generate from a prompt or edit from up to 10 references, in five resolution tiers and fifteen aspect ratios plus auto.

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Text and image input
768, 1K, 1.5K, 2K or 4K output
15 aspect ratios plus auto
Up to 10 reference images

FLUX 3 Image Klein is an open-weights image generation and editing model from Black Forest Labs. It takes a prompt on its own, or a prompt with up to 10 reference images to edit a photo or keep a character or product consistent across shots. It renders at the same tiers as FLUX 3 Image, 768, 1K, 1.5K, 2K, and 4K, in fifteen aspect ratios from 21:9 to 9:21, or auto to follow the reference.

On Treza it sits in the Image Generation node's picker and in chat. In our tests a 1K square came back in about 5 seconds and an edit with one reference in about 10, so it suits drafts, batches, and storyboards. A finished still wires straight into the rest of the pipeline, as a first frame for a video model or a frame in a carousel. It bills from prepaid credits, and a failed generation costs nothing.

Built for volume

A few cents or less per image at every tier up to 2K, so a pipeline can draft many options and keep the best.

Up to 10 references

Attach a product, a character, or a setting and keep it consistent across a set of images.

Generate and edit in one model

Write a prompt to start fresh, or attach a photo and describe the change. The same node does both.

Fifteen aspect ratios

From 21:9 banners to 9:21 tall strips, including 9:16 for Stories and 4:5 for feeds, or auto to match the reference.

What to make with FLUX 3 Image Klein

Prompts to try, and what to expect back. Each runs on an Image Generation node with FLUX 3 Image Klein picked in the model menu.

“A ceramic cup of coffee on a sunlit wooden cafe table, steam rising, shallow depth of field”

A warm product-style still.

“The same folded shirt (attached) on a white marble counter in a bright studio”

Your product moved into a new set.

“Twelve storyboard frames of the same character (attached) walking through a rainy city, 9:16”

A consistent set of vertical frames.

“Fifty 768 thumbnails of a logo mascot in different poses”

Low-cost drafts to choose from.

FLUX 3 Image Klein is one node on a canvas

Chain it with language, image, and video models, then publish the whole pipeline as an API. See how a full AI video pipeline fits together.

Step 01
Draft the brief
A language model node expands a one-line idea into a detailed, on-brand prompt before it ever reaches the model.
Step 02
Generate with FLUX 3 Image Klein
Run variants in parallel, compare against other models on the same prompt, and keep every result in run history.
Step 03
Publish it as an API
The pipeline becomes a versioned endpoint. Your product calls it with the typed /invoke API or any OpenAI SDK.

FLUX 3 Image Klein as an API, priced per image

The FLUX 3 Image Klein API

Build a pipeline with FLUX 3 Image Klein on a node and publish it. It becomes a versioned HTTP endpoint: the typed /invoke route enqueues a run and returns a run id to poll, and an OpenAI-compatible route works with SDKs you already use. Agents connect over MCP the same way. Your prompt engineering ships inside the pipeline, so every caller gets your quality, and swapping the model later does not change the API your product calls.

FLUX 3 Image Klein pricing

Prepaid credits, no subscription. Each image is charged at FLUX 3 Image Klein's own rate from your balance, shown before you run, and a failed generation costs nothing. Credit packs start at $5 and never expire, which suits spiky production schedules. Run history records the cost of every generation, per node, so spend is auditable rather than a surprise.

FLUX 3 Image Klein, answered

How is FLUX 3 Image Klein different from FLUX 3 Image?

Both take up to 10 references and render at the same five tiers. Klein is the open-weights model and costs a fraction of FLUX 3 Image at every tier, which makes it the pick for drafts and batches. Run one prompt through both on two nodes and compare.

Which resolutions does FLUX 3 Image Klein support?

Five tiers: 768, 1K, 1.5K, 2K, and 4K, each with its own price. Model default renders a 1024 by 1024 square at the 1K price.

Can I use FLUX 3 Image Klein in chat?

Yes. Ask for FLUX 3 Image Klein by name in Treza chat, or pick it on an Image Generation node to run it inside a pipeline.

How much does FLUX 3 Image Klein cost on Treza?

Treza uses prepaid credits with no subscription. Each image is charged at FLUX 3 Image Klein's rate from your balance, and only successful generations are charged. Credit packs start at $5 and never expire.

Can I call FLUX 3 Image Klein through an API?

Yes. Build a pipeline that uses FLUX 3 Image Klein and publish it as a versioned HTTP endpoint. Call the typed /invoke API from your product, or point any OpenAI SDK at the OpenAI-compatible endpoint. If a better model ships later, swap it on the node without changing the API your product calls.