Black Forest Labs

FLUX.2 Klein 4B

Name: Black Forest Labs FLUX.2 Klein 4B
Author: Black Forest Labs

Try It Compare

2026-01-13

Try It Compare

FLUX.2 [klein] 4B is the fastest model in the FLUX.2 family, a 4-billion-parameter rectified flow transformer capable of sub-second image generation and editing on consumer GPUs with as little as 13GB of VRAM. Despite its compact size, it delivers photorealistic output at up to 4 megapixels with accurate text rendering, coherent spatial relationships, and consistent detail preservation during edits. Released under the Apache 2.0 license, it is designed for real-time applications, rapid creative iteration, and lightweight deployment on accessible hardware.

Vision|Open ModelApache 2.0

Knowledge Cutoff

Unknown

The date this AI finished learning. It may not know about things that happened after this date.

Input → Output Format

The types of content this AI can receive, and what it can produce in return.

Context Memory

42KIN42KOUT

The maximum amount of text the AI can read and process in a single request. A larger number means it can handle longer documents or conversations.

API Cost

$0.014/ megapixel

The cost when using without a subscription plan. Pricing may vary by quality, resolution, or generation mode.

Calculate Cost

AI Performance Evaluation

Arena Image Score

1027

±3

As of 2026-04-23

Overall Rank

No.45

113,383 Votes

Arena by Image Category

Art

1027±7No.47

Cartoon

1018±5No.44

Photorealistic

1046±5No.46

Portraits

1054±6No.42

Text Rendering

1009±5No.48

3D Modeling

1027±8No.46

Commercial Design

1022±5No.49

Source:Arena Intelligence

Black Forest Labs