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Image model vs image model

FLUX.2 Klein 9B vs FLUX1.1 [pro]

People picked FLUX.2 Klein 9B’s picture over FLUX1.1 [pro]’s about 58% of the time in blind votes, and it costs 6.7× less: $0.006 against $0.04 an image.

By ModelCompare ·

$0.006 and $0.04 a picture, paid from your credits. New accounts start with free credit.

At a glance

Longer bar means the bigger number. Elo bars start at 800.

Blind votes · how often people would pick each picture

FLUX.2 Klein 9B FLUX1.1 [pro]

Price per image · 1024×1024, lower is better

FLUX.2 Klein 9B$0.006
FLUX1.1 [pro]$0.04

Text to image · arena Elo, higher is better

FLUX.2 Klein 9B929
FLUX1.1 [pro]870

Same prompt, both models

We give every image model the same fixed prompts. Here is what FLUX.2 Klein 9B and FLUX1.1 [pro] made. Each made one picture per prompt; nothing was picked or retouched.

Photo

“A cozy bookshop on a rainy Tokyo street at night, warm window light, reflections on wet pavement, 35mm film photo”

FLUX.2 Klein 9B’s picture for “A cozy bookshop on a rainy Tokyo street at night, warm window light, reflections on wet pavement, 35mm film photo”

FLUX.2 Klein 9B

FLUX1.1 [pro]’s picture for “A cozy bookshop on a rainy Tokyo street at night, warm window light, reflections on wet pavement, 35mm film photo”

FLUX1.1 [pro]

Text in image

“A minimalist logo for a coffee brand called "Orbit Roasters", flat vector, two colours, the name clearly lettered”

FLUX.2 Klein 9B’s picture for “A minimalist logo for a coffee brand called "Orbit Roasters", flat vector, two colours, the name clearly lettered”

FLUX.2 Klein 9B

FLUX1.1 [pro]’s picture for “A minimalist logo for a coffee brand called "Orbit Roasters", flat vector, two colours, the name clearly lettered”

FLUX1.1 [pro]

Product shot

“A glass perfume bottle on wet black stone, soft studio lighting, water droplets, high-end product photography”

FLUX.2 Klein 9B’s picture for “A glass perfume bottle on wet black stone, soft studio lighting, water droplets, high-end product photography”

FLUX.2 Klein 9B

FLUX1.1 [pro]’s picture for “A glass perfume bottle on wet black stone, soft studio lighting, water droplets, high-end product photography”

FLUX1.1 [pro]

Try your own prompt on both

Where they sit among all 56 image models

Up and to the left is better pictures for less money. Hover or tap a dot for its numbers, then click it to compare that model with FLUX.2 Klein 9B. Models the arena hasn’t rated yet sit in the grey lane at the bottom.

Quality: Elo from the Artificial Analysis text-to-image arena. Price: one 1024×1024 image, on a log scale. The dashed line joins the best picture you can get at each price.

Which one to pick

Pick FLUX.2 Klein 9B if

  • you want the better picture: in blind votes people chose its image over FLUX1.1 [pro]’s about 58% of the time
  • price matters: 100 images cost $0.60, against $4.00 with FLUX1.1 [pro]
  • you need to edit pictures you upload; FLUX1.1 [pro] only makes new ones here
  • you want open weights you can run yourself

See what both make of your prompt

The specs

Spec FLUX.2 Klein 9B FLUX1.1 [pro]
Price per image$0.006 ($0.022 per edit)$0.04
100 images$0.60$4.00
Text-to-image Elo929 ±10 (#75 in the arena)870 ±19 (#90 in the arena)
Editing Elo1015 ±13 (#43 in the arena)Not scored yet
Arena votes10,7302,247
Edits uploaded picturesYesNo
Largest size——
Open weightsYesNo
Zero data retention—No
LabBlack Forest LabsBlack Forest Labs
Official nameFLUX.2 [klein] 9BFLUX1.1 [pro]
ReleasedJanuary 2026October 2024

Elo ± is the 95% margin. Prices are for one 1024×1024 image from the Vercel AI Gateway and fal.ai.

Questions

Which is better, FLUX.2 Klein 9B or FLUX1.1 [pro]?

People picked FLUX.2 Klein 9B’s picture over FLUX1.1 [pro]’s about 58% of the time in blind votes, and it costs 6.7× less: $0.006 against $0.04 an image.

Which is cheaper, FLUX.2 Klein 9B or FLUX1.1 [pro]?

FLUX.2 Klein 9B: $0.006 for a 1024×1024 image, against $0.04 for FLUX1.1 [pro]. 100 images cost $0.60 and $4.00.

Can FLUX.2 Klein 9B and FLUX1.1 [pro] edit images?

FLUX.2 Klein 9B can change a picture you upload. FLUX1.1 [pro] only makes new pictures from a prompt here.

How can I compare FLUX.2 Klein 9B and FLUX1.1 [pro] myself?

Open the comparison, type one prompt and both models draw it side by side, each with what it cost and how long it took. You sign up with Google before your first run, and new accounts start with free credit.

Still deciding? Send one prompt to both and see the pictures side by side, with what each one cost. Compare FLUX.2 Klein 9B and FLUX1.1 [pro] →

Where the numbers come from

Quality scores are Elo ratings from the Artificial Analysis image arenas, where people vote between two pictures made from the same prompt without knowing which model made which. The vote split comes from the Elo gap. Prices are for one 1024×1024 image from the Vercel AI Gateway and fal.ai; models billed per token are estimated at the quality the arena scored. The sample pictures are our own runs. Updated October 25, 2026.