The arena · AI image generator review
FLUX
by Black Forest Labs
The open-weight champion: 32B FLUX.2 wins 66.6% of head-to-heads vs open rivals, API from $0.014 per image
From $3/mo
Pure pay-as-you-go API, no subscription: FLUX.2 [klein] 4B from $0.014 and 9B from $0.015 per image, [pro] from $0.03, [flex] from $0.05, [max] from $0.07 for the first megapixel (1 credit = $0.01, extra megapixels billed on top); about $3 covers 100 [pro] images, a realistic entry; [dev] and [klein] weights are free to self-host. Verified against bfl.ai/pricing and docs.bfl.ml 2026-07.
Black Forest Labs
Open weights free to self-host: [klein] 4B Apache 2.0, 9B non-commercial, [dev] 32B non-commercial
4MP (about 2048x2048)
Yes
Yes
Yes
What is FLUX?
Image generation and editing model family from Black Forest Labs, the German lab founded by the original Stable Diffusion authors. FLUX.2, a 32B flow-matching transformer released November 25, 2025, spans managed API endpoints (pro, flex, max) and open weights you can self-host: the 32B [dev] on Hugging Face and the Apache 2.0 [klein] 4B/9B distills.
FLUX pros & cons
Pros
- FLUX.2 [dev] leads every open-weight rival by a wide margin: 66.6% text-to-image win rate vs 51.3% for Qwen-Image and 48.1% for HunyuanImage 3.0
- Cheapest frontier-quality API in the category: FLUX.2 [klein] from $0.014 per image, [pro] from $0.03, [max] from $0.07 (first megapixel)
- Real open weights: [dev] 32B on Hugging Face for research, [klein] 4B under Apache 2.0, 9B under a non-commercial license, with full control, LoRA fine-tuning and no vendor lock-in
- Edits images at up to 4 megapixels while keeping character, product and brand-style consistency across multiple reference images
- Pure pay-as-you-go, no subscription or seat fees (1 credit = $0.01), which suits spiky production workloads
- First-class ComfyUI and NVIDIA RTX optimization support at launch
Cons
- FLUX.2 [dev] is heavy: about 32-35GB VRAM even in FP8/Q8 quantization and 64GB+ at BF16, so a single RTX 4090 only runs a heavily quantized Q4 build
- [dev] weights are non-commercial: any business use of self-hosted outputs requires a paid BFL license or falling back to the API
- Developer-first product with no polished consumer app on par with Midjourney or ChatGPT: expect ComfyUI, the API playground or code
- Fragmented lineup (pro, flex, max, dev, klein 4B/9B plus legacy FLUX.1 endpoints) makes choosing the right model genuinely confusing
The arena’s verdict
The developer's pick. If you need open weights, fine-tuning or the lowest API bill, FLUX.2 is the strongest option of mid-2026: [pro] at $0.03 per image undercuts GPT Image 2's medium tier, and [klein] runs on consumer GPUs under a true Apache 2.0 license. Skip it if you want a polished consumer creative suite, that is Midjourney's and ChatGPT's territory. And read the license before self-hosting [dev]: commercial use of the 32B weights requires paying Black Forest Labs.
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Top FLUX alternatives
All alternativesThe only AI that outputs real editable SVGs, and its V4 model tops the Hugging Face arena ahead of Midjourney V8 and FLUX
Still the aesthetic reference in AI imagery: V8.1 renders 4-5x faster with native 2K, from $10/month
OpenAI's GPT Image 2 (April 2026) took #1 on Image Arena by a record +242 points, with ~99% text accuracy
Compare FLUX head-to-head
What the crowd says
“Multi-reference consistency is the killer feature. Same character across a 12-image campaign without a single LoRA training run.”
“We render thousands of product variants a month at $0.03 a shot on pro tier. The bill is a rounding error compared to OpenAI high quality.”
“Klein 9B on my 4090 gets me 90% of what I was paying an API for, and it's Apache licensed so I can actually ship it. No brainer.”
FLUX: frequently asked questions
Is FLUX free?
FLUX offers a free tier (Open weights free to self-host: [klein] 4B Apache 2.0, 9B non-commercial, [dev] 32B non-commercial). Paid plans start at $3/mo.
How much does FLUX cost?
FLUX starts at $3/mo (n/a). Pure pay-as-you-go API, no subscription: FLUX.2 [klein] 4B from $0.014 and 9B from $0.015 per image, [pro] from $0.03, [flex] from $0.05, [max] from $0.07 for the first megapixel (1 credit = $0.01, extra megapixels billed on top); about $3 covers 100 [pro] images, a realistic entry; [dev] and [klein] weights are free to self-host. Verified against bfl.ai/pricing and docs.bfl.ml 2026-07.