FLUX.1 [dev]

FLUX.1 [dev] is a 12 billion parameter flow transformer that generates high-quality images from text prompts, suitable for personal and commercial use.

By Black Forest Labs

Pricing: $0.025 per megapixel

Overview

FLUX.1 [dev] is a 12 billion parameter flow transformer that turns text prompts into high-quality, detailed images. It balances strong prompt adherence with fine visual detail, making it a dependable choice for both personal and commercial projects.

Key capabilities

• $0.025 per megapixel, roughly 40 one-megapixel images per $1 with simple fixed per-call pricing.
• Multi-region failover. Runflow runs optimized inference across multiple regions, routing around outages automatically.
• Excellent prompt adherence from a 12B flow transformer architecture, capturing complex compositions and fine detail.
• Flexible output sizing and adjustable guidance for control over how closely the image follows your prompt.
• Batch generation of multiple images per request for fast iteration.

Technical specifications

| Spec | Detail |

| --- | --- |

| Architecture | 12B parameter flow transformer |

| Resolution | Configurable image size, billed per megapixel |

| Output format | JPEG, PNG |

Examples

• A close-up portrait of an elderly fisherman with weathered skin and a salt-and-pepper beard, golden hour light raking across his face, shallow depth of field, photorealistic, 85mm lens
• A matte black ceramic coffee mug on a polished concrete surface, soft studio lighting, subtle steam rising, minimalist commercial product photography, crisp shadows
• A floating island with cascading waterfalls and ancient stone ruins, lush green vegetation, drifting clouds below, warm amber sunset, epic wide-angle composition, highly detailed
• Flat vector illustration of a person working at a desk surrounded by plants, warm muted color palette, clean shapes, modern editorial style for a tech magazine

Frequently asked questions

What is FLUX.1 [dev]?

FLUX.1 [dev] is a 12 billion parameter flow transformer that generates high-quality images from text prompts. It is designed for strong prompt adherence and detailed output, and it is suitable for personal and commercial use.

How much does FLUX.1 [dev] cost on Runflow?

FLUX.1 [dev] costs $0.025 per megapixel with simple fixed per-call pricing. That is roughly 40 one-megapixel images per $1, so a standard square image is well under three cents.

How long does FLUX.1 [dev] take to run?

Most generations complete in a few seconds. Using the acceleration setting or fewer inference steps speeds things up, while more steps trade speed for additional detail.

Can I use FLUX.1 [dev] commercially?

Yes. FLUX.1 [dev] is licensed for both personal and commercial use, so you can use the generated images in your products and content.

Do I need to manage GPUs or infrastructure?

No. Runflow handles all the infrastructure with multi-region failover, so you can call the model through a single API. No GPUs and no AI team required.

How do I get started with FLUX.1 [dev] on Runflow?

Sign up for a Runflow account, grab your API key, and send a prompt to the FLUX.1 [dev] endpoint. You can set image size, output format, and number of images in the same request.

Related models

• FLUX.1 [schnell], FLUX.1 [schnell] is a 12 billion parameter flow transformer that generates high-quality images from text in 1 to 4 steps, suitable for personal and commercial use.
• FLUX 1.1 [pro] Ultra, Ultra-resolution variant of FLUX 1.1 [pro] with 4MP+ outputs and richer detail. Drop-in upgrade when the standard FLUX 1.1 [pro] resolution is the bottleneck.
• FLUX 1.1 [pro], Black Forest Labs' production-grade FLUX 1.1. State-of-the-art prompt adherence and photoreal quality at competitive per-image pricing.
• SDXL-Lightning, ByteDance lightning-fast SDXL distillation. 4-step text-to-image at near-real-time latency.

Discoverable surfaces

• Dispatch endpoint: POST https://api.runflow.io/v1/models/flux-dev-lt1/runs
• Per-model spec (markdown): https://app.runflow.io/models/flux-dev-lt1/llms.txt
• Docs page: https://docs.runflow.io/models/flux-dev-lt1
• Public OpenAPI spec: https://docs.runflow.io/api/openapi.public.json
• Agent skill (start here): https://www.runflow.io/.well-known/agent-skills/runflow/SKILL.md