AI Models · Comparison
FLUX.1 vs Stable Diffusion 3.5
Updated Jun 15, 2026 · 1 min read
FLUX.1VSStable Diffusion 3.5
Quick Answer
Best overallDepends on use
Best qualityFLUX.1
Best for open/commercialStable Diffusion 3.5
Best free & fastFLUX.1 [schnell]
Side-by-Side Comparison
How FLUX.1, Stable Diffusion 3.5 compare across the features that matter most.
| Feature | FLUX.1 | Stable Diffusion 3.5 |
|---|---|---|
| Developer | Black Forest Labs | Stability AI |
| Released | August 2024 | October 2024 |
| Architecture | Rectified flow transformer, 12B params | Multimodal Diffusion Transformer (MMDiT) |
| Variants | pro (API), dev (open, non-commercial), schnell (Apache 2.0) | Large (8.1B), Large Turbo, Medium (2.5B) |
| Licensing | schnell Apache 2.0; dev non-commercial; pro closed API | Stability AI Community License (open) |
| Fast option | schnell generates in 1-4 steps | Large Turbo generates in 4 steps |
| Native resolution | 1024x1024, flexible aspect ratios | Up to 1MP (Large); 0.25-2MP (Medium) |
| Best for | State-of-the-art quality & prompt adherence | Open, tunable image generation at multiple sizes |
KLYROO Test
Our comparison philosophy is to evaluate tools with consistent tasks and realistic workflows across categories such as writing, coding, research, reasoning, image generation, summarization and data analysis. Where we have not run a controlled head-to-head, we label the assessment clearly: this comparison is an editorial evaluation based on documented features and available evidence. We never invent benchmark numbers.
Which One Should You Choose?
- Choose FLUX.1 for cutting-edge image quality and prompt adherence, with an Apache-2.0 'schnell' for free/fast use.
- Choose Stable Diffusion 3.5 for a permissive community license and variants that scale from consumer GPUs up.
- Both are open-weight, available on Hugging Face and run locally via ComfyUI/Diffusers.
Frequently Asked Questions
It depends on your use case. Overall we lean toward Depends on use, but the best pick varies by need — see the recommendations above.