Model family
FLUX NSFW: which FLUX models are uncensored?
Short answer
It depends on the tier. The open-weights FLUX.2 models, Dev and the Klein family, softened some runs but refused none. The commercial tiers are firm: FLUX.2 Pro refused 25 of 50 runs, Flex 25 of 50 and Max 29 of 50. One pattern runs through all six FLUX.2 models tested with 50 runs each: none delivered a single Very strong run.
- 20 versions tested
- 2 delivered every run at all five levels
- 504 test runs counted
Every version, side by side
| Version | Mild → Maximumdelivered / runs | Delivered | Softened | Refused | Blind test | From | Link |
|---|---|---|---|---|---|---|---|
| FLUX 3 Klein LoRA |
| 8/10 | 2 | 0 | — | $0.018/image at 1k | Run |
| FLUX.2 Klein 9B LoRA |
| 10/10 | 0 | 0 | — | $0.018/image | Run |
| FLUX.2 Klein Base 9B LoRA |
| 10/10 | 0 | 0 | — | $0.024/image | Run |
| FLUX 3 Klein |
| 8/10 | 2 | 0 | 72.6 | $0.012/image at 1k | Run |
| FLUX.2 Dev |
| 37/50 | 13 | 0 | 66 | $0.0116/image at 1k | Run |
| FLUX.2 Klein 9B |
| 36/50 | 14 | 0 | 67.7 | $0.011/image at 1k | Run |
| FLUX.1 Krea Dev LoRA |
| 8/8 | 0 | 0 | — | $0.024/image | Run |
| FLUX.1 Schnell LoRA |
| 8/8 | 0 | 0 | — | $0.006/image | Run |
| FLUX.2 Dev LoRA |
| 8/8 | 0 | 0 | — | $0.0216/image | Run |
| FLUX.2 Klein 4B LoRA |
| 8/8 | 0 | 0 | — | $0.0156/image | Run |
| FLUX.2 Klein Base 4B LoRA |
| 7/7 | 0 | 0 | — | $0.018/image | Run |
| FLUX 3 |
| 22/91 | 0 | 69 | 62.2 | $0.06/sec at 1080p | Run |
| FLUX.2 Klein 4B |
| 31/50 | 19 | 0 | 67.2 | $0.0093/image at 1k | Run |
| FLUX.1 Dev LoRA |
| 10/22 | 12 | 0 | 59.7 | $0.018/image | Run |
| FLUX.2 Pro |
| 12/50 | 13 | 25 | 69.4 | $0.03/image at 1k | Run |
| FLUX 3 Klein Base |
| 0/5 | 5 | 0 | 67.9 | $0.036/image at 1k | Run |
| FLUX.2 Flex |
| 8/50 | 17 | 25 | 72.1 | $0.0578/image at 1k | Run |
| FLUX.2 Max |
| 6/50 | 15 | 29 | 71.8 | $0.07/image at 1k | Run |
| FLUX.1 Fill Dev LoRA |
| 4/4 | 0 | 0 | — | $0.042/image | Run |
| FLUX.1 Dev ControlNet LoRA |
| 3/3 | 0 | 0 | — | $0.036/image | Run |
A dash means that level has not been tested yet. Softened runs returned something milder than requested; refused runs returned nothing. Data as of 2026-11-07; see how we test.
Version by version
FLUX 3 Klein LoRA
Image edit, Text to image · 1k / 2k · loads LoRA files
Delivered every run except Very strong (0 of 2). 8 of 10 runs delivered, 2 softened, 0 refused. Blind test —. From $0.018/image at 1k.
FLUX.2 Klein 9B LoRA
Image edit, Text to image · 1k / 2k · loads LoRA files
Delivered every run at all five levels. 10 of 10 runs delivered, 0 softened, 0 refused. Blind test —. From $0.018/image.
FLUX.2 Klein Base 9B LoRA
Image edit, Text to image · 1k / 2k · loads LoRA files
Delivered every run at all five levels. 10 of 10 runs delivered, 0 softened, 0 refused. Blind test —. From $0.024/image.
FLUX 3 Klein
Image edit, Text to image · 1k / 2k
Delivered every run except Very strong (0 of 2). 8 of 10 runs delivered, 2 softened, 0 refused. Blind test 72.6. From $0.012/image at 1k.
FLUX.2 Dev
Image edit, Text to image · 1k / 2k
Delivered every run except Moderate (4 of 8) and Strong (9 of 10) and Very strong (0 of 8). 37 of 50 runs delivered, 13 softened, 0 refused. Blind test 66. From $0.0116/image at 1k.
FLUX.2 Klein 9B
Image edit, Text to image · 1k / 2k
Delivered every run except Strong (4 of 10) and Very strong (0 of 8). 36 of 50 runs delivered, 14 softened, 0 refused. Blind test 67.7. From $0.011/image at 1k.
FLUX.1 Krea Dev LoRA
Image edit, Text to image · 1k / 1.5k · loads LoRA files
8 of 8 tested runs delivered; Very strong not tested yet. 8 of 8 runs delivered, 0 softened, 0 refused. Blind test —. From $0.024/image.
FLUX.1 Schnell LoRA
Image edit, Text to image · 1k / 1.5k · loads LoRA files
8 of 8 tested runs delivered; Very strong not tested yet. 8 of 8 runs delivered, 0 softened, 0 refused. Blind test —. From $0.006/image.
FLUX.2 Dev LoRA
Image edit, Text to image · 1k / 2k · loads LoRA files
8 of 8 tested runs delivered; Very strong not tested yet. 8 of 8 runs delivered, 0 softened, 0 refused. Blind test —. From $0.0216/image.
FLUX.2 Klein 4B LoRA
Image edit, Text to image · 1k / 2k · loads LoRA files
8 of 8 tested runs delivered; Very strong not tested yet. 8 of 8 runs delivered, 0 softened, 0 refused. Blind test —. From $0.0156/image.
FLUX.2 Klein Base 4B LoRA
Image edit, Text to image · 1k / 2k · loads LoRA files
7 of 7 tested runs delivered; Very strong not tested yet. 7 of 7 runs delivered, 0 softened, 0 refused. Blind test —. From $0.018/image.
FLUX 3
Image to video, Text to video, Upscale, Video extend · 720p / 1080p · 5–20 s clips · optional sound
Held back at every level, from Mild up. 22 of 91 runs delivered, 0 softened, 69 refused. Blind test 62.2. From $0.06/sec at 1080p.
FLUX.2 Klein 4B
Image edit, Text to image · 1k / 2k
Clean up to Mild; held back from Moderate up. 31 of 50 runs delivered, 19 softened, 0 refused. Blind test 67.2. From $0.0093/image at 1k.
FLUX.1 Dev LoRA
Image edit, Text to image · loads LoRA files
Clean up to Moderate; held back from Strong up. 10 of 22 runs delivered, 12 softened, 0 refused. Blind test 59.7. From $0.018/image.
FLUX.2 Pro
Image edit, Text to image · 1k / 2k
Held back at every level, from Mild up. 12 of 50 runs delivered, 13 softened, 25 refused. Blind test 69.4. From $0.03/image at 1k.
FLUX 3 Klein Base
Image edit, Text to image · 1k / 2k
0 of 5 tested runs delivered; Mild and Moderate not tested yet. 0 of 5 runs delivered, 5 softened, 0 refused. Blind test 67.9. From $0.036/image at 1k.
FLUX.2 Flex
Image edit, Text to image · 1k / 2k
Held back at every level, from Mild up. 8 of 50 runs delivered, 17 softened, 25 refused. Blind test 72.1. From $0.0578/image at 1k.
FLUX.2 Max
Image edit, Text to image · 1k / 2k
Held back at every level, from Mild up. 6 of 50 runs delivered, 15 softened, 29 refused. Blind test 71.8. From $0.07/image at 1k.
FLUX.1 Fill Dev LoRA
Image edit · 1k / 1.5k · loads LoRA files
4 of 4 tested runs delivered; Very strong not tested yet. 4 of 4 runs delivered, 0 softened, 0 refused. Blind test —. From $0.042/image.
FLUX.1 Dev ControlNet LoRA
Text to image · 1k / 1.5k · loads LoRA files
3 of 3 tested runs delivered; Very strong and Maximum not tested yet. 3 of 3 runs delivered, 0 softened, 0 refused. Blind test —. From $0.036/image.
Open weights versus commercial tiers
FLUX.2 Dev delivered 37 of 50 runs and Klein 9B 36 of 50, with every miss a softened image rather than a refusal. Both delivered all 16 of their Maximum runs. FLUX.2 Pro, Flex and Max behave like filtered services: refusals make up half or more of their runs, and they delivered between 2 and 5 of 16 Maximum runs.
Price runs the same way. FLUX.2 Klein 4B starts under a cent per image and Dev at about a cent, while the commercial tiers cost several times more for less range.
The gap at Very strong
Every one of the six 50-run FLUX.2 models delivered none of its eight Very strong runs, while the open models cleared nearly all of their Maximum runs. The same oddity appears in a few other families, such as some Qwen and Z-Image LoRA builds. If your work sits at that level, FLUX.2 is not the family to rely on.
FLUX 3 and the LoRA builds
FLUX 3 Klein delivered 8 of 10 runs, softening both Very strong runs. The FLUX 3 video model is a different case: it refused 69 of its 91 runs, which puts it among the most filtered video models in our data.
The FLUX LoRA builds mostly have small samples. The two Klein 9B LoRA builds delivered all 10 runs each across five levels; most of the others delivered every run they received but have not been tested at Very strong yet.
Questions
Is FLUX Dev uncensored?
Largely. FLUX.2 Dev delivered 37 of 50 runs and refused none, though it delivered none of its Very strong runs.
Is FLUX Pro NSFW?
No. FLUX.2 Pro refused 25 of its 50 runs and delivered 12.
Does FLUX allow NSFW content?
2 of the 20 FLUX versions we tested delivered every NSFW test run at all five levels. The most permissive fully tested FLUX version was FLUX.2 Klein 9B LoRA (10 of 10 delivered); the least permissive was FLUX.2 Max (6 of 50).
Is FLUX free to use?
No hosted FLUX version is free. On SpicyAPI the cheapest FLUX option is FLUX.1 Schnell LoRA, from $0.006/image, and you only pay for what you generate.
Can I use my own image with FLUX?
19 FLUX versions accept an image as input, including FLUX 3 Klein LoRA, FLUX.2 Klein 9B LoRA, FLUX.2 Klein Base 9B LoRA. Use images you made or have rights to: FLUX may not be used with photos of real, identifiable people.
Does FLUX allow content involving minors?
No. FLUX may never be used for content involving minors, and none of our FLUX tests include it. Such requests break the terms of every FLUX version listed here.