Image model vs image model
FLUX.2 Klein 9B vs Seedream 4.0
FLUX.2 Klein 9B ranks 31st of the 49 models we list with a text-to-image arena score; Seedream 4.0 hasn’t been rated yet. FLUX.2 Klein 9B costs 5× less ($0.006 against $0.03 an image).
At a glance
Longer bar means the bigger number. Elo bars start at 800.
Price per image · 1024×1024, lower is better
Same prompt, both models
We give every image model the same fixed prompts. Here is what FLUX.2 Klein 9B and Seedream 4.0 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
Seedream 4.0
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
Seedream 4.0
Product shot
“A glass perfume bottle on wet black stone, soft studio lighting, water droplets, high-end product photography”
FLUX.2 Klein 9B
Seedream 4.0
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.
Which one to pick
Pick FLUX.2 Klein 9B if
- you want a model with a track record: it ranks 31st of the 49 models we list with a text-to-image arena score, and Seedream 4.0 has no arena score yet
- price matters: 100 images cost $0.60, against $3.00 with Seedream 4.0
- you need to edit pictures you upload; Seedream 4.0 only makes new ones here
- you want open weights you can run yourself
The specs
| Spec | FLUX.2 Klein 9B | Seedream 4.0 |
|---|---|---|
| Price per image | $0.006 ($0.022 per edit) | $0.03 |
| 100 images | $0.60 | $3.00 |
| Text-to-image Elo | 929 ±10 (#75 in the arena) | Not scored yet |
| Editing Elo | 1015 ±13 (#43 in the arena) | Not scored yet |
| Arena votes | 10,730 | — |
| Edits uploaded pictures | Yes | No |
| Largest size | — | — |
| Open weights | Yes | No |
| Zero data retention | — | No |
| Lab | Black Forest Labs | ByteDance |
| Official name | FLUX.2 [klein] 9B | Seedream 4.0 |
| Released | January 2026 | September 2025 |
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 Seedream 4.0?
FLUX.2 Klein 9B ranks 31st of the 49 models we list with a text-to-image arena score; Seedream 4.0 hasn’t been rated yet. FLUX.2 Klein 9B costs 5× less ($0.006 against $0.03 an image).
Which is cheaper, FLUX.2 Klein 9B or Seedream 4.0?
FLUX.2 Klein 9B: $0.006 for a 1024×1024 image, against $0.03 for Seedream 4.0. 100 images cost $0.60 and $3.00.
Can FLUX.2 Klein 9B and Seedream 4.0 edit images?
FLUX.2 Klein 9B can change a picture you upload. Seedream 4.0 only makes new pictures from a prompt here.
How can I compare FLUX.2 Klein 9B and Seedream 4.0 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.
Related comparisons
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.