FLUX vs Stable Diffusion
FLUX vs Stable Diffusion: prompt accuracy, output quality and pricing — find the best image generator. FLUX is best for aI image & video generation, native.
FLUX Best for: AI image & video generation, native audio, text rendering, multi-reference editing, self-hostable open-weight models | Stable Diffusion Best for: Open-source image generation, local inference, video AI, audio generation | |
| Overview | Flux is an image, video, and world-model family from Black Forest Labs. The current generation is FLUX 3 (image, video with native audio, an open-weights Action/robotics model, and the open-weights Image Klein variant), with the FLUX.2 lineup still offered alongside it. | Stable Diffusion is Stability AI's open-weights text-to-image model. The current line is Stable Diffusion 3.5 (Large 8.1B, Large Turbo, and Medium 2.5B), free to self-host under the Community License for anyone under $1M in annual revenue, with a paid hosted API for teams that prefer not to run it themselves. |
| Pricing | Freemium | Freemium |
| Users | — | — |
| Advantages | ✅FLUX 3 extends the lineup beyond images to video generation with native audio and open-weight Action/robotics and Image Klein models ✅Multi-reference support (up to about 10 images) keeps characters and styles consistent across generations ✅FLUX 3 Image Klein's INT8 build runs on consumer GeForce RTX GPUs with as little as 8GB VRAM, generating a 1MP image in about 4 seconds on an RTX 5090 ✅Pay-as-you-go per-image and per-second pricing, with no subscriptions or seat fees, starting from $0.009 per image with FLUX 3 Image Klein ✅FLUX 3 Image Klein weights are free for commercial use for individuals and companies with annual revenue under $5M, alongside the Apache-2.0 FLUX.1 [schnell] | ✅Open weights you can download and run locally with full control over the pipeline ✅Free to self-host under the Community License for individuals and orgs under $1M revenue ✅Three SD 3.5 variants (Large, Large Turbo, Medium) let you match the model to your hardware ✅Enormous ecosystem of fine-tunes, LoRAs, ControlNets and local UIs built around it ✅Optional hosted API with transparent per-image credit pricing if you don't want to run it yourself |
| Disadvantages | ❌Top-tier FLUX 3 Image/Video and FLUX.2 [pro]/[max] models are API-only and paid; there is no free hosted tier ❌Per-image and per-second billing scales with resolution and duration, reaching over $0.60/image at 4k and up to $0.80/second for FLUX 3 Video ❌The vendor's pricing calculator has shown different default figures than its published 'from' prices for some FLUX.2 tiers ❌Open weights carry license restrictions: FLUX 3 Image Klein's free commercial use applies only to companies with annual revenue under $5M, FLUX.1 [dev] remains non-commercial, and larger-scale self-hosting needs a separate paid license ❌A growing lineup across FLUX 3, FLUX.2, and legacy FLUX.1 tiers can be confusing when choosing a model | ❌The larger models need a capable GPU to run smoothly at home ❌Free self-hosting is revenue-gated; orgs over $1M need a paid Enterprise License ❌Good results usually require prompt tuning and post-processing ❌Hosted API costs add up at volume (about $0.08/image for Ultra, $0.03 for Core) |
| Rating | … | … |
| Website | bfl.ai | stability.ai |
Verdict: Which Should You Choose?
Choose FLUX if…
- ✅ You need video generation with native audio alongside image generation, which FLUX 3 Video supports natively.
- ✅ You want multi-reference input across up to about 10 images to keep characters and styles consistent in generations.
- ✅ You want a model built for consumer GPUs with as little as 8GB VRAM, like FLUX 3 Image Klein, which generates a 1MP image in about 4 seconds on an RTX 5090.
- ✅ You want pay-as-you-go pricing with no subscriptions or seat fees, starting from about $0.009 per image with FLUX 3 Image Klein.
Choose Stable Diffusion if…
- ✅ You want to tap into a massive existing ecosystem of fine-tunes, LoRAs, ControlNets, and local UIs built specifically around Stable Diffusion.
- ✅ You want free self-hosting under one clear Community License covering all SD 3.5 variants, rather than tracking license terms across FLUX's growing lineup of generations.
- ✅ You want to choose between three model sizes, Large, Large Turbo, and Medium, to match the model to your available GPU.
- ✅ You want transparent per-image credit pricing on a hosted API, like about $0.08 per image for Ultra or $0.03 for Core, without comparing FLUX's many per-resolution tiers.