Flux 3 Klein on NightCafe

What is Flux 3 Klein?

Flux 3 Klein is Black Forest Labs' fast, affordable version of Flux 3. It launched on NightCafe on 20 October 2026 as a PRO model.

Use it when you want Flux 3 generation, editing, and 4K output without paying Flux 3 flagship prices. It does text-to-image, prompt-to-edit, multi-image fusion (up to 4 reference images), and consistent characters.

Independent Artificial Analysis image arenas have not listed Flux 3 Klein yet (as of 20 October 2026). The full FLUX 3 Image model sits around the low teens on the text-to-image board. On NightCafe, treat Klein as the value Flux 3 — from 0.75 credits at 1K — not a replacement for GPT Image 2.5 Flare on Quality Low (~1 credit) when you want the everyday all-rounder.

Curious how it looks next to other models? NightCafe's free AI Model Comparison puts the same prompts side by side.

What it's good at

Low credit cost — 1K starts at 0.75 credits, 2K at 1.75, 4K at 10 (no reference images).
1K, 2K and 4K — Medium is about 1K (the default), High is about 2K, Ultra is 4K with the long edge capped at 4096 pixels.
Prompt to Edit — add a start image and describe the change. An edit costs 1.5 credits (the 1K price with one reference).
Multi-image fusion — combine up to 4 reference images in one generation. Reference images add credits, with the extra cost capped after two references at every resolution.
Consistent characters — keep a subject looking the same across creations. A character counts as one reference.
Seed control — you can reuse a seed, unlike full Flux 3.

How to use it

In Studio, pick Flux 3 Klein from the model picker (Flux / Black Forest Labs). Write a prompt, optionally add start images, choose Resolution, then Generate.

You can generate up to 4 images at a time. Resolution defaults to Medium (about 1K).

Write a clear brief: subject, action, setting, camera, and any exact text in quotation marks. For an edit, add the image as a Start Image and describe only the change. For fusion, give each reference a job (for example one face, one outfit, one background).

A square product photo for an online shop. A ceramic pour-over coffee dripper in matte speckled cream sits on a walnut board, with a linen cloth and a small bowl of coffee beans. Soft window light from the left. The kraft card in front reads "HOUSE BLEND". Photoreal, clean background.

Change the card text to "SINGLE ORIGIN" and keep the dripper, board, lighting, and camera position the same.

Resolution and credits

Credits are per image. Reference images add a surcharge that is capped after two references.

Resolution	About	No references	1 reference	2 or more references
Medium (default)	~1K (1024×1024 square)	0.75	1.5	2.5
High	~2K (2048×2048 square)	1.75	2.75	3.75
Ultra	~4K (4096px on the long edge)	10	11.75	13.5

Prompt-to-edit uses the 1K + one-reference price: 1.5 credits, regardless of the source image size.

Flux 3 Klein is not an unlimited model.

Flux 3 Klein vs Flux 3

	Flux 3 Klein	Flux 3
Who it's for	Fast, cheaper Flux 3	Flagship Flux 3 quality and extra references
PRO	Yes	Yes
1K credits (no refs)	0.75	4.75 (Medium)
4K credits (no refs)	10	60.75 (Ultra)
Reference images	Up to 4 (adds credits, capped after 2)	Up to 10 (included in the output price)
Seed	Yes	No (random each time)
Low (~0.75K) resolution	No — starts at 1K	Yes (4 credits)

Good to know

Flux 3 Klein is PRO only.
Resolution defaults to Medium (1K). There is no Low / 0.75K setting.
You can attach up to 4 start images. Extra credits apply, capped after two.
Output is up to four images per generate.
Flux 2 Klein 9B Fast remains the free-account Klein. Prefer Flux 3 Klein if you have PRO.