Curiosity · AI Model
Black Forest Labs FLUX.1 [pro]
FLUX.1 [pro] is the flagship text-to-image model from Black Forest Labs, the team originally behind Stable Diffusion. It tops many human-preference benchmarks on prompt adherence and photorealism, and is the closed, API-only sibling of the open-weight FLUX.1 [dev] / [schnell] releases.
Model specs
- Vendor
- Black Forest Labs
- Family
- FLUX.1
- Released
- 2024-08
- Context window
- 1 tokens
- Modalities
- text, vision
- Input price
- n/a
- Output price
- n/a
- Pricing as of
- 2026-04-20
Strengths
- State-of-the-art photorealism and portrait quality
- Strong prompt adherence on complex compositions
- Available on bfl.ai, Replicate, Fal, and Together API
- FLUX.1.1 [pro] refresh improves speed and quality further
Limitations
- No token context — priced per image
- Closed weights — FLUX.1 [dev] is the self-hostable alternative
- Smaller LoRA ecosystem than Stable Diffusion
- Usage terms restrict generating images of real named individuals
Use cases
- Premium marketing and editorial photography
- Fashion and product photography mockups
- Film and game concept art
- High-end blog and landing-page imagery
Benchmarks
| Benchmark | Score | As of |
|---|---|---|
| GenEval composition | ≈0.78 | 2024-08 |
| Human preference vs SDXL | ≈75% win-rate | 2024-08 |
Frequently asked questions
What is FLUX.1 [pro]?
FLUX.1 [pro] is the flagship closed-source text-to-image model from Black Forest Labs. It is served through the bfl.ai API and partner platforms (Replicate, Fal, Together). It leads GenEval and human-preference benchmarks for general-purpose image generation.
How is it different from FLUX.1 [dev]?
FLUX.1 [pro] is closed-weight and API-only with the highest quality. FLUX.1 [dev] ships with open weights under a non-commercial licence for research and experimentation. FLUX.1 [schnell] is a faster Apache-licensed distilled variant.
How is FLUX.1 [pro] priced?
Pricing is per image. Via bfl.ai and partners, FLUX.1 [pro] images typically cost USD 0.04–0.06 per render, with FLUX.1.1 [pro] slightly more for the improved variant.
Is it safe for enterprise use?
FLUX.1 [pro] exposes standard content-safety filters through the API. Users should also respect the terms that restrict generating images of real named individuals, even though the model is technically capable.
Sources
- Black Forest Labs — FLUX.1 announcement — accessed 2026-04-20
- bfl.ai — API docs — accessed 2026-04-20