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Black Forest Labs · image

FLUX

High-quality open-weight image models from the original Stable Diffusion team.

Not on AiLoftOpen weights
See FLUX alternatives

Overview

FLUX is a family of image models from Black Forest Labs, founded by researchers behind the original Stable Diffusion. Some variants ship open weights that you can run locally in ComfyUI or Diffusers and fine-tune with LoRAs, while the strongest Pro variants are offered through APIs. FLUX is known for photorealism and strong prompt adherence.

Best for

  • Self-hosted pipelines
  • Custom styles via LoRA fine-tuning

Specs

SpecFLUX
DeveloperBlack Forest Labs
Typeimage
Where to use itOpen-weight variants for local use; Pro variants via API partners
PriceFree to run locally (license varies by variant); API priced per image.
Open weightsYes

Strengths

  • Open weights you can run and fine-tune
  • Photoreal output with good prompt adherence
  • Huge LoRA ecosystem

Limitations

  • Local use needs a capable GPU and setup time
  • Some open variants have non-commercial licenses

Compare FLUX

Head-to-head breakdowns with the models people weigh it against.

GPT Image 2.5 vs FLUXNano Banana Pro vs FLUX

Top FLUX alternatives

See FLUX alternatives
GPT Image 2.5OpenAI’s latest image model: sharp detail, readable text and faithful edits.Available on AiLoftFrom 30 creditsNano Banana ProGoogle’s Gemini 3 Pro Image: photoreal scenes with world knowledge, up to 4K.Available on AiLoftFrom 10 creditsNano Banana 2Fast, affordable Gemini Flash image generation with up to 4K output.Available on AiLoftFrom 5 creditsGPT Image 2OpenAI’s previous-generation image model with selectable quality tiers.Available on AiLoftFrom 2 creditsMidjourneyThe aesthetic benchmark for artistic, stylized imagery.Not on AiLoftStable DiffusionThe open-source image model with the largest ecosystem.Not on AiLoftOpen weights

FAQ

What is FLUX?

FLUX is a family of image models from Black Forest Labs, founded by researchers behind the original Stable Diffusion. Some variants ship open weights that you can run locally in ComfyUI or Diffusers and fine-tune with LoRAs, while the strongest Pro variants are offered through APIs. FLUX is known for photorealism and strong prompt adherence.

How much does FLUX cost?

Free to run locally (license varies by variant); API priced per image.

Can I use FLUX on AiLoft?

FLUX isn't hosted on AiLoft. The closest models you can run here are GPT Image 2.5, Nano Banana Pro and Nano Banana 2 — with pay-as-you-go credits and a side-by-side compare mode.

What is FLUX best for?

Self-hosted pipelines and Custom styles via LoRA fine-tuning

Is FLUX open source?

Yes — FLUX publishes open weights for at least some variants, so you can download and run it locally. Check each variant’s license before commercial use.

What are the best alternatives to FLUX?

Popular alternatives include GPT Image 2.5, Nano Banana Pro, Nano Banana 2 and GPT Image 2. See the alternatives page for a full breakdown.

Want FLUX-style results without the subscription?

Try the closest models on AiLoft with pay-as-you-go credits and compare them side by side.

Compare across models