FLUX (Black Forest Labs) review

FLUX is a model family that several other tools here also offer, and Black Forest Labs sells it directly. There is no subscription: the pricing page lists FLUX 3 Image at $0.041 per image at 768 x 768, rising to $0.10 at 2K and $0.607 at 4K, while FLUX 3 Image Klein runs from $0.008 to $0.036 per image. Klein ships with open weights, has 5.6B parameters and runs on a single consumer GPU, so technical users can host it themselves under a license. The catalog also includes FLUX.2 models priced per megapixel, FLUX.1 Kontext for editing, and tools for outpainting, object removal and virtual try-on. A browser playground lets you test prompts without code. The tradeoff is ease of use: this is an API product with no templates, brand kits or design workspace, and costs climb quickly at 4K. For developers building image features, or creators comfortable with tools like ComfyUI, it offers frontier quality at a low per-image price.

Who it is for

Developers and technical creators who want top models priced per image, without a subscription.

Price

Pay as you go, no subscription; FLUX 3 Image Klein from $0.008 per image, FLUX 3 Image from $0.041 per image.

FLUX 3 Image Klein $0.008 /img
Quoted from the vendor pricing page on November 9, 2026.

Key features

• FLUX 3 Image for text to image and image to image
• FLUX 3 Image Klein with open weights, 5.6B parameters, runs on a single consumer GPU
• Editing tools for outpainting, erase, inpainting and virtual try-on
• Browser playground for testing without code
• Open-weights licenses for self-hosting, from 10K images a month

Strengths and weaknesses

• Strength: No subscriptions or seat fees
• Strength: Klein costs under a cent per image at 1K
• Strength: Self-hosting option through open-weights licensing
• Weakness: Built for developers; most features sit behind an API
• Weakness: 4K images with FLUX 3 Image cost $0.607 each
• Weakness: No design workspace, templates or brand tools

Key facts

• Billing: Pay as you go, per image or megapixel
• Cheapest image: $0.008 with FLUX 3 Image Klein at 768 x 768
• Security: SOC 2 Type II and ISO 27001

Where it ranks

FLUX (Black Forest Labs) is No. 9 in our Best AI Image Generators verdict.