Black Forest Labs

FLUX.2

FLUX.2 covers text-to-image creation and, where exposed by the selected version, editing from one or more reference images. The variants differ deliberately: [klein] favors fast iteration, [pro] targets general production work, [flex] exposes finer generation control, and [max] prioritizes final assets and can use grounding search. Detailed prompts are especially important for [klein], which does not rely on prompt upsampling.

How to use this model

  1. 1

    Pick the version by intent: [klein] for rapid drafts, [pro] for production, [flex] for typography and control, or [max] for final assets.

  2. 2

    Write a structured prompt covering subject, composition, camera, lighting, materials, color, and any text that must appear.

  3. 3

    Add reference images only when the selected version exposes editing, and state the role of each reference explicitly.

  4. 4

    Choose the aspect ratio and resolution for the real placement instead of cropping a finished result afterward.

  5. 5

    Review typography, hands, brand colors, and reference consistency, then change one prompt variable at a time.

2 FlexAvailable

FLUX.2 [flex]

FLUX.2 [flex] is the controllable family member, with adjustable generation steps and guidance for deliberate quality tuning. It is especially suited to typography and preservation of small details in generated or edited assets. More control also means settings should be changed systematically rather than maximized by default.

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Properties

  • Supports generation and reference-image editing.
  • Exposes adjustable steps and guidance for finer control.
  • Specialized for typography and small-detail preservation.

Best for

  • Typography
  • Fine detail
  • Adjustable generation control

Avoid for

  • Outputs above four megapixels

Tips

  • Add reference images to switch from generation to editing.
  • Output dimensions are normalized to multiples of 64.

How to use this model

  1. 1

    Write exact visible wording and describe its placement, hierarchy, and style.

  2. 2

    Add references for the elements that must remain visually consistent.

  3. 3

    Start from moderate steps and guidance rather than maximum values.

  4. 4

    Choose output dimensions that give small text enough pixel space.

  5. 5

    Inspect every character and fine edge, then tune one control at a time.

Parameters

Prompt

prompt
Required

Reference Images

reference_images
Optional

Optional images to edit or use as visual references.

Aspect Ratio

aspect_ratio
Optional
Default: 1:1

  • 21:9

  • 16:9

  • 3:2

  • 4:3

  • 5:4

  • 1:1

  • 4:5

  • 3:4

  • 2:3

  • 9:16

Resolution

resolution
Optional

Approximate output size; exact dimensions are multiples of 64 and capped at 4MP.

Default: 1K

  • 1K

  • 2K

  • 3K

Enhance Prompt

enhance_prompt
Optional

Automatically add visual detail to the prompt. Turn this off to use the prompt exactly as written.

Default: true

Guidance

guidance
Optional
Default: 5Range: 1.5 – 10

Steps

steps
Optional
Default: 50Range: 1 – 50

Seed

seed
Optional
2 Klein 4BAvailable

FLUX.2 [klein] 4B

This [klein] 4B entry supports both new image generation and edits with reference images. It favors rapid iteration and throughput while keeping the core FLUX.2 prompt and composition controls. Write explicit prompts and identify each reference's role because the model does not depend on prompt upsampling.

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Properties

  • Supports text-to-image and reference-image editing in Omnipix.
  • Square output supports the exposed 1K and 2K choices.

Best for

  • Lowest latency
  • High-volume generation
  • Cost-efficient editing

Avoid for

  • Outputs above four megapixels

Tips

  • Add reference images to switch from generation to editing.
  • Output dimensions are normalized to multiples of 64.

How to use this model

  1. 1

    Write a detailed scene or edit instruction with explicit preserve/change requirements.

  2. 2

    Add references only when editing and name their roles in the prompt.

  3. 3

    Choose aspect ratio and 1K or 2K output according to placement.

  4. 4

    Use rapid drafts to settle composition before requesting small details.

  5. 5

    Check reference identity and text closely before the final run.

FLUX.2 Klein 4B selected in the Omnipix image workspace
Select FLUX and FLUX.2 [klein] 4B, then add optional references and write the prompt. The capture uses the Russian interface; the English layout is identical.

Examples

A mountain valley combining four seasons
A colorful landscape generated with the direct FLUX.2 Klein runtime.

Parameters

Prompt

prompt
Required

Reference Images

reference_images
Optional

Optional images to edit or use as visual references.

Aspect Ratio

aspect_ratio
Optional
Default: 1:1

  • 21:9

  • 16:9

  • 3:2

  • 4:3

  • 5:4

  • 1:1

  • 4:5

  • 3:4

  • 2:3

  • 9:16

Resolution

resolution
Optional

Approximate output size; exact dimensions are multiples of 64 and capped at 4MP.

Default: 1K

  • 1K

  • 2K

  • 3K

Seed

seed
Optional
2 Klein 9BAvailable

FLUX.2 [klein] 9B

FLUX.2 [klein] 9B is the larger fast variant, positioned between the compact 4B model and the production-focused FLUX.2 versions. It supports generation and reference editing while retaining the quick, distilled [klein] workflow. Choose it when rapid iteration matters but the 4B result is not detailed enough.

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Properties

  • Supports generation and reference-image editing.
  • Larger [klein] variant balanced for quality and speed.

Best for

  • Fast generation
  • Balanced quality and speed
  • High-volume editing

Avoid for

  • Outputs above four megapixels

Tips

  • Add reference images to switch from generation to editing.
  • Output dimensions are normalized to multiples of 64.

How to use this model

  1. 1

    Describe the scene and required visual relationships in detail.

  2. 2

    Add references for editing and assign each a subject, style, or composition role.

  3. 3

    Choose dimensions and resolution before generation.

  4. 4

    Compare a fast draft with 4B only if speed is the deciding factor.

  5. 5

    Verify small structures, faces, and typography in the chosen result.

Examples

Example output from FLUX.2 [klein] 9B
A reviewed image output created with FLUX.2 [klein] 9B in Omnipix.

Parameters

Prompt

prompt
Required

Reference Images

reference_images
Optional

Optional images to edit or use as visual references.

Aspect Ratio

aspect_ratio
Optional
Default: 1:1

  • 21:9

  • 16:9

  • 3:2

  • 4:3

  • 5:4

  • 1:1

  • 4:5

  • 3:4

  • 2:3

  • 9:16

Resolution

resolution
Optional

Approximate output size; exact dimensions are multiples of 64 and capped at 4MP.

Default: 1K

  • 1K

  • 2K

  • 3K

Seed

seed
Optional
2 MaxAvailable

FLUX.2 [max]

FLUX.2 [max] prioritizes final-asset quality, prompt following, editing consistency, and faithful style representation. It can use grounding search when the prompt requires current real-world information. Use it for the final pass after composition is settled, and verify any time-sensitive facts visible in the image.

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Properties

  • Supports generation and precise reference-guided editing.
  • Can use grounding search when requested.
  • Intended for highest-quality final assets in the FLUX.2 family.

Best for

  • Highest-quality final assets
  • Grounded current imagery
  • Precise image editing

Avoid for

  • Outputs above four megapixels

Tips

  • Add reference images to switch from generation to editing.
  • Output dimensions are normalized to multiples of 64.

How to use this model

  1. 1

    Finalize the composition and creative brief before moving to [max].

  2. 2

    Provide explicit references and preserve/change instructions for each one.

  3. 3

    Request grounding only when current real-world information is relevant.

  4. 4

    Choose the final aspect ratio and resolution before generation.

  5. 5

    Verify visible facts, typography, identity, style, and small production details independently.

Examples

Example output from FLUX.2 [max]
A reviewed image output created with FLUX.2 [max] in Omnipix.

Parameters

Prompt

prompt
Required

Reference Images

reference_images
Optional

Optional images to edit or use as visual references.

Aspect Ratio

aspect_ratio
Optional
Default: 1:1

  • 21:9

  • 16:9

  • 3:2

  • 4:3

  • 5:4

  • 1:1

  • 4:5

  • 3:4

  • 2:3

  • 9:16

Resolution

resolution
Optional

Approximate output size; exact dimensions are multiples of 64 and capped at 4MP.

Default: 1K

  • 1K

  • 2K

  • 3K

Enhance Prompt

enhance_prompt
Optional

Automatically add visual detail to the prompt. Turn this off to use the prompt exactly as written.

Default: true

Seed

seed
Optional
2 ProAvailable

FLUX.2 [pro]

FLUX.2 [pro] is the general production model in the family, designed for both new assets and reference-guided edits. It is a strong default when [klein] is too draft-oriented but [max] or [flex] has a more specialized role. Use references deliberately and keep the combined input and output size within the exposed limits.

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Properties

  • Supports text-to-image and reference-guided editing.
  • General production choice within the FLUX.2 family.

Best for

  • Production generation
  • Image editing
  • Multi-reference composition

Avoid for

  • Outputs above four megapixels

Tips

  • Add reference images to switch from generation to editing.
  • Output dimensions are normalized to multiples of 64.
  • Input and output are limited to nine megapixels in total.

How to use this model

  1. 1

    Start with a production brief covering composition, brand constraints, and output use.

  2. 2

    Add references and state which subject, product, pose, color, or style comes from each.

  3. 3

    Choose aspect ratio and dimensions before refining the prompt.

  4. 4

    Generate a review draft, then adjust one production constraint at a time.

  5. 5

    Inspect brand colors, product geometry, text, faces, and reference consistency at full size.

Examples

Example output from FLUX.2 [pro]
A reviewed image output created with FLUX.2 [pro] in Omnipix.

Parameters

Prompt

prompt
Required

Reference Images

reference_images
Optional

Optional images to edit or use as visual references.

Aspect Ratio

aspect_ratio
Optional
Default: 1:1

  • 21:9

  • 16:9

  • 3:2

  • 4:3

  • 5:4

  • 1:1

  • 4:5

  • 3:4

  • 2:3

  • 9:16

Resolution

resolution
Optional

Approximate output size; exact dimensions are multiples of 64 and capped at 4MP.

Default: 1K

  • 1K

  • 2K

  • 3K

Enhance Prompt

enhance_prompt
Optional

Automatically add visual detail to the prompt. Turn this off to use the prompt exactly as written.

Default: true

Seed

seed
Optional
2 Klein 4BRetired

2 [klein] 4B

This catalog entry exposes the compact 4B [klein] variant for text-to-image generation. It is a practical choice for quick exploration and high-volume drafting, but it needs a detailed prompt because [klein] does not automatically expand sparse instructions. Use another FLUX.2 entry when reference-image editing is required.

Properties

  • Text-to-image workflow in this Omnipix entry.
  • Detailed prompts are recommended because prompt upsampling is not used.

How to use this model

  1. 1

    Describe the complete scene rather than relying on a short concept phrase.

  2. 2

    Include subject, pose, composition, lighting, materials, palette, and style.

  3. 3

    Choose aspect ratio and output size for the destination.

  4. 4

    Generate several drafts and compare composition before refining surface detail.

  5. 5

    Move to an editing-capable FLUX.2 version if a source image must be preserved.

Examples

An infinity pool overlooking a city at dusk
Architectural evening scene generated with FLUX.2 Klein.

Parameters

Seed

seed
Optional

Random seed. Set for reproducible generation

Images

images
Optional

List of input images for image-to-image generation. Maximum 5 images. Must be jpeg, png, gif, or webp.

Default: []

Prompt

prompt
Required

Text prompt for image generation.

Go Fast

go_fast
Optional

Run faster predictions with additional optimizations.

Default: false

aspect_ratio

aspect_ratio
Optional

Aspect ratio for the generated image. Use 'match_input_image' to match the aspect ratio of the first input image.

Default: 1:1

  • 21:9

  • 16:9

  • 3:2

  • 4:3

  • 5:4

  • 1:1

  • 4:5

  • 3:4

  • 2:3

  • 9:16

  • 9:21

  • match_input_image

Output Format

output_format
Optional

Format of the output images

Default: jpg

  • webp

  • jpg

  • png

Output Quality

output_quality
Optional

Quality when saving the output images, from 0 to 100. 100 is best quality, 0 is lowest quality. Not relevant for .png outputs.

Default: 95Range: 0 – 100

Output Megapixels

output_megapixels
Optional

Resolution of the output image in megapixels

Default: 1

  • 0.25

  • 0.5

  • 1

  • 2

  • 4