FLUX 3 Image Klein vs FLUX.3 Image and the budget image models

FLUX 3 Image Klein is Black Forest Labs' compact 5.6B-parameter open-weights image model. It handles text-to-image, image editing and multi-reference generation with up to 10 reference images, with native 4K output and bounding boxes to control where elements go. It ships as a step-distilled model for fast generation and a base model for fine-tuning and LoRAs. BFL says the INT8 build runs on RTX GPUs with as little as 8 GB of VRAM.

Pricing (per 1M image-output tokens; text input is free on all five):

• FLUX 3 Image Klein: $1.92, the cheapest here and about 5× cheaper than the FLUX.3 Image flagship ($9.82)
• Muse Image (Meta) $2.40
• Seedream 5.0 Flash (ByteDance) $4.31
• Qwen Image 2.1 Turbo $4.41

Choosing between them: Klein is the default for high-volume generation and editing. BFL's internal evaluations put it ahead of FLUX.2 [klein] 9B by 91 Elo in text-to-image and 70 in editing. Pay for FLUX.3 Image when you need the extra quality on hero shots. Muse Image is close on price. Qwen Image 2.1 Turbo is also open-weight (7B), but it uses a different license.

Caveats: Klein is under the FLUX Kommunity License, which allows free commercial use for companies under $5M annual revenue. Larger companies need a self-hosting license or the BFL API. BFL recommends its prompt upsampler, because the model is trained on the captions it writes. The number of tokens per image depends on resolution, so benchmark the cost per image at your own sizes.

FLUX 3 Image Klein (Black Forest Labs)