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Black Forest Labs

FLUX.2 [klein] 4B

Best commercial-safe FLUX to pair with LoRAs on users' GPUs. 1 credits per image, about 1 s per run. Sample price.

Join the list Compare all models
pixel art sprite, a fire-breathing dragon with red scales, game asset, transparent background
FLUX.2 [klein] 4B spec
StatusLive
TypeImage
Versionklein 4B (Jan 2026)
Resolutions1MP · 2K
AudioNo audio track
LicenceApache-2.0 (4B only; klein 9B is FLUX Non-Commercial)
Where it runsMilvey GPUs. The run queues if the pool is full.
Typical time~1 s
Price1 cr per image

Prices and times are samples.

A 1,000 cr pack buys

1000 imagessample

At 1 cr per image. Credit prices

  • Fully permissive open FLUX
  • ~1 s generation
  • Multi-reference editing

FLUX.2 [klein] 4B runs on Milvey GPUs.

Open models run on Milvey GPUs, and the price follows that GPU time. If the pool is full, the run waits in a queue until capacity returns. It never moves to a paid API. If the run can’t be delivered, the hold is released and you pay 0 cr.

How failed runs are charged
  1. Milvey GPU pool~1 s

Published FLUX.2 samples

Sources and licences
pixel art sprite, a fire-breathing dragon with red scales, game asset, transparent background

pixel art sprite, a fire-breathing dragon with red scales, game asset, transparent background

FLUX.2 klein 4B· Apache-2.0

a red bicycle leaning on a whitewashed wall, morning light

a red bicycle leaning on a whitewashed wall, morning light

FLUX.2 klein 4B· Apache-2.0

a capybara wearing a tiny knitted hat, sitting in a hot spring, steam, soft light

a capybara wearing a tiny knitted hat, sitting in a hot spring, steam, soft light

FLUX.2 klein 4B· Apache-2.0

Community examples

All community examples

Made by other people with LoRAs and checkpoints based on FLUX.2 [klein] 4B. Each one is credited and linked to its source. They are not Milvey outputs. Removal requests: see Terms.

Klein Anatomy / Quality Fixer: community examplePaid runs OK

Klein Anatomy / Quality Fixer

by @l226 on Civitai

Community example of what this model can produce. Not an Milvey output.

LoRACivitai

Licence: Sell images they generate, run on Civitai, run on services that generate for money, sell this model, sell merges using this model. Base: Apache-2.0 (FLUX.2 klein 4B).

Ethereal Gothic - Klein4B: community exampleNot available for paid runs

Ethereal Gothic - Klein4B

by @ArsMachina on Civitai

Community example of what this model can produce. Not an Milvey output.

LoRACivitai

Licence: Sell images they generate, run on Civitai. Base: Apache-2.0 (FLUX.2 klein 4B).

The creator's licence does not grant "run on services that generate for money", so it is viewable here but not runnable.

Ethereal Gothic - Klein4B: community exampleNot available for paid runs

Ethereal Gothic - Klein4B

by @ArsMachina on Civitai

Community example of what this model can produce. Not an Milvey output.

LoRACivitai

Licence: Sell images they generate, run on Civitai. Base: Apache-2.0 (FLUX.2 klein 4B).

The creator's licence does not grant "run on services that generate for money", so it is viewable here but not runnable.

gmic Icon_Klein 2D Two dimensional.safetensors: community examplePaid runs OK

gmic Icon_Klein 2D Two dimensional.safetensors

by @ConceptConnoisseur on Civitai

Community example of what this model can produce. Not an Milvey output.

LoRACivitai

Licence: Sell images they generate, run on Civitai, run on services that generate for money, sell this model, sell merges using this model. Base: Apache-2.0 (FLUX.2 klein 4B).

gmic Icon_Klein 2D Two dimensional.safetensors: community examplePaid runs OK

gmic Icon_Klein 2D Two dimensional.safetensors

by @ConceptConnoisseur on Civitai

Community example of what this model can produce. Not an Milvey output.

LoRACivitai

Licence: Sell images they generate, run on Civitai, run on services that generate for money, sell this model, sell merges using this model. Base: Apache-2.0 (FLUX.2 klein 4B).

Flux Klein FP8: community examplePaid runs OK

Flux Klein FP8

by @denrakeiw on Civitai

Community example of what this model can produce. Not an Milvey output.

CheckpointCivitai

Licence: Sell images they generate, run on Civitai, run on services that generate for money, sell this model, sell merges using this model. Base: Apache-2.0 (FLUX.2 klein 4B).

Showing 6 of 14. See them all.

LoRAs for this model

LoRA library
a red bicycle leaning on a whitewashed wall, morning light
SpeedPaid runs OK

FLUX.2-klein Sana-Sprint LoRA

2-step sampling LoRA for FLUX.2 klein 4B.

Licence: Apache-2.0

Sample: radames · Apache-2.0

Source
pixel art sprite, a fire-breathing dragon with red scales, game asset, transparent background
StylePaid runs OK

Pixel Art LoRA (FLUX.2 klein 4B)

Pixel-art sprites and game assets.

Licence: Apache-2.0

Sample: Limbicnation · Apache-2.0

Source

Licence: Apache-2.0 (4B only; klein 9B is FLUX Non-Commercial)

Paid runs OK

Open weights. Read the licence text for attribution or usage terms that apply to your project.

Known unknowns

Nothing flagged for this model.

Sources for specs and licence

  • huggingface.co/black-forest-labs/FLUX.2-klein-4B

Other image models

Black Forest Labs

FLUX1 cr

Sharp stills for keyframes, boards and thumbnails.

~6s · 4 routes

per image

ByteDance

Seedream 4.08 cr

Editable stills with strong reference control.

~9s · 2 routes

per image

Black Forest Labs

FLUX 3 Image12 cr

Edit variant: blackforestlabs/flux-3/edit-image.

Seconds at 1MP · 2 routes

per 1MP image

Try FLUX.2 [klein] 4B with 150 free credits.

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FLUX.2 [klein] 4B · Milvey