Image model comparison

FLUX 3 vs FLUX 3 Image Klein

Black Forest Labs' FLUX 3 and Black Forest Labs' FLUX 3 Image Klein, side by side: price per image, image sizes, editing and aspect ratios — and when to choose which. Both run on one CheaperGen API key.

Black Forest Labs

Up to −34%

FLUX3

FLUX 3

Black Forest Labs' newest image model — grounded, layout-aware, up to 4K

from

$0.0317/image

Black Forest Labs

Up to −87%

FLUX 3Image Klein

FLUX 3 Image Klein

The open-weights FLUX 3 — 16-step images in seconds, from a fraction of a cent

from

$0.0011/image

Price

FLUX 3 vs FLUX 3 Image Klein: price per image

Live prices at the tiers both models offer. Official list prices are on each model's pricing page.

FLUX 3 and FLUX 3 Image Klein prices at shared tiers
Tier	FLUX 3	FLUX 3 Image Klein	Cheaper
1K	$0.0317/image	$0.0019/image With a monthly plan: Pro $0.0018Max $0.0017	FLUX 3 Image Klein −94%
1.5K	$0.0644/image	$0.0043/image With a monthly plan: Pro $0.004Max $0.0038	FLUX 3 Image Klein −93%
2K	$0.092/image	$0.0074/image With a monthly plan: Pro $0.0069Max $0.0065	FLUX 3 Image Klein −92%
4K	$0.5073/image	$0.0342/image	FLUX 3 Image Klein −93%

Monthly plans lower prices on most models (shown under each price); you can still pay as you go. Pro $499/month · Max $4,999/month.

FLUX 3 pricing →Cheapest FLUX 3 API →FLUX 3 Image Klein pricing →Cheapest FLUX 3 Image Klein API →

Specs

Side-by-side specifications

From each model's API parameters in our catalog.

FLUX 3 vs FLUX 3 Image Klein specifications
Spec	FLUX 3	FLUX 3 Image Klein
Developer	Black Forest Labs	Black Forest Labs
Released	Oct 1, 2026	Oct 15, 2026
Tasks	Text to image, Image editing	Text to image, Image editing
Sizes	1K · 1.5K · 2K · 4K	768 · 1K · 1.5K · 2K · 4K
Edit inputs	Up to 10 images	Up to 10 images
Quality levels	—	—
Aspect ratios	15 (1:1, 4:5, 3:4, 2:3, 9:16, 1:2…)	16 (1:1, 4:5, 3:4, 2:3, 9:16, 1:2…)
Starting price	$0.0317/image (1K)	$0.0011/image (768)
Below official price	up to 34%	up to 87%

Verdict

When to choose which

Each point below comes from the price and spec data above.

Choose FLUX 3 for

The same tasks at a similar price — pick by output style; try both in the Studio.

FLUX 3 at a glance

Up to 4K — 1K, 1.5K, 2K and 4K tiers
10 references — Free reference images
Grounded — Knows real things
15 ratios — 21:9 to 9:21

Choose FLUX 3 Image Klein for

Lower price: $0.0019/image vs $0.0317/image at 1K (94% less).
More aspect ratios: 16 vs 15.
Newer model (released October 15, 2026).

FLUX 3 Image Klein at a glance

Fraction of a cent — Per 1K image
16 steps — Seconds per image
Up to 4K — 768 to 4K
10 references — Image editing

Try both with the same prompt

Same API key and balance; only the endpoint changes. Failed generations are refunded.

POST /api/v1/run/bfl/flux-3/text-to-image
POST /api/v1/run/bfl/flux-3-image-klein/text-to-image

FLUX 3 in Studio FLUX 3 Image Klein in Studio

FAQ

FLUX 3 vs FLUX 3 Image Klein questions

FLUX 3 Image Klein is cheaper at 4 of 4 shared tiers. 1K: FLUX 3 $0.0317/image, FLUX 3 Image Klein $0.0019/image; 1.5K: FLUX 3 $0.0644/image, FLUX 3 Image Klein $0.0043/image; 2K: FLUX 3 $0.092/image, FLUX 3 Image Klein $0.0074/image; 4K: FLUX 3 $0.5073/image, FLUX 3 Image Klein $0.0342/image. Prices are live and billed per image.

FLUX 3: up to 4K, edits with up to 10 input images. FLUX 3 Image Klein: up to 4K, edits with up to 10 input images.

Yes. Both run through the same CheaperGen API and balance: POST /v1/run/{endpoint} with the model's endpoint id, then poll or receive a webhook. Switching models means changing the endpoint and its input fields — no new account or SDK.

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FLUX 3 is developed by Black Forest Labs. CheaperGen provides API access and does not own the model. FLUX 3 Image Klein is Black Forest Labs' open-weights model. CheaperGen provides API access to the open weights, run on GPU inference for open-source models, and does not own the model. Trademarks belong to their respective owners.