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Black Forest Labs

Black Forest Labs: FLUX.2 Klein 4B

black-forest-labs/flux.2-klein-4b

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FLUX.2 [klein] 4B is the fastest and most cost-effective model in the FLUX.2 family, optimized for high-throughput use cases while maintaining excellent image quality. Pricing is based on the output image. The first generated megapixel is charged $0.014. Each subsequent megapixel is charged $0.001.

Input
$0

/ 1M tokens · Token reference

Output
$0

/ 1M tokens · Token reference

Context window
40.96K

tokens

Image output · Token reference fields do not establish an output-unit price.

Limits

Context

40,960

tokens

Max output

36,864

90% of the context window

Parameters

3,875,544,576

Model facts

Author

Black Forest Labs

Tokenizer

Other

Modality

Text + Image -> Image

License

Apache-2.0

Created

Jan 14, 2026

Hugging Face

black-forest-labs/FLUX.2-klein-4B

Publication status

Hugging Face: verifiedLicense: publishedParameter count: published

Modalities

Input · TextInput · ImageOutput · Image

Generation controls

Seed

Creative tasks

Category performance

imageediting
Top 100%

1057 Elo

39.1% win

image
Top 100%

1063 Elo

38.8% win

graphicdesign
Top 100%

1004 Elo

35.7% win