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Favicon for black-forest-labs

Black Forest Labs: FLUX.2 Klein 4B

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

Model weights
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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.

Modalities
Price
$0.014/megapixel
Context
41K
Released
Jan 14, 2026
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