Image model vs image model
FLUX.2 Dev Flash vs FLUX.2 Klein 4B
People picked FLUX.2 Dev Flash’s picture over FLUX.2 Klein 4B’s about 70% of the time in blind votes, and they cost about the same ($0.005 against $0.005 an image).
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 Dev Flash FLUX.2 Klein 4B
Text to image · arena Elo, higher is better
Editing · arena Elo, higher is better
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 Dev Flash. Models the arena hasn’t rated yet sit in the grey lane at the bottom.
Which one to pick
Pick FLUX.2 Dev Flash if
- you want the better picture: in blind votes people chose its image over FLUX.2 Klein 4B’s about 70% of the time
- you mostly edit pictures: it scores higher in the editing arena (Elo 1012 against 938)
The specs
| Spec | FLUX.2 Dev Flash | FLUX.2 Klein 4B |
|---|---|---|
| Price per image | $0.005 ($0.01 per edit) | $0.005 ($0.02 per edit) |
| 100 images | $0.50 | $0.50 |
| Text-to-image Elo | 988 ±12 (#55 in the arena) | 837 ±12 (#96 in the arena) |
| Editing Elo | 1012 ±18 (#44 in the arena) | 938 ±17 (#62 in the arena) |
| Arena votes | 5,344 | 6,418 |
| Edits uploaded pictures | Yes | Yes |
| Largest size | — | — |
| Open weights | Yes | Yes |
| Zero data retention | — | — |
| Lab | fal | Black Forest Labs |
| Official name | FLUX.2 [dev] Flash | FLUX.2 [klein] 4B |
| Released | December 2025 | January 2026 |
Elo ± is the 95% margin. Prices are for one 1024×1024 image from fal.ai.
Questions
Which is better, FLUX.2 Dev Flash or FLUX.2 Klein 4B?
People picked FLUX.2 Dev Flash’s picture over FLUX.2 Klein 4B’s about 70% of the time in blind votes, and they cost about the same ($0.005 against $0.005 an image).
Which is cheaper, FLUX.2 Dev Flash or FLUX.2 Klein 4B?
They cost about the same: FLUX.2 Dev Flash $0.005 and FLUX.2 Klein 4B $0.005 for a 1024×1024 image.
Can FLUX.2 Dev Flash and FLUX.2 Klein 4B edit images?
Yes, both can change a picture you upload. In the Artificial Analysis editing arena FLUX.2 Dev Flash has an Elo of 1012 and FLUX.2 Klein 4B 938.
How can I compare FLUX.2 Dev Flash and FLUX.2 Klein 4B 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 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.