FLUX.1 [dev]

Black Forest Labs
Image Generation

The open-weight 12B rectified-flow transformer from Black Forest Labs. Close to FLUX Pro quality with a guidance-distilled checkpoint released under a non-commercial license. The most widely fine-tuned base in the FLUX family.

Generate with FLUX.1 [dev]
Describe what you want and pick a size — the image renders inline.
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TL;DR·Last updated June 24, 2026

FLUX.1 [dev] is image generation AI model from Black Forest Labs, priced at €0.000 per 1M input tokens with a unknown context window.

About this model

FLUX.1 [dev] is the openly released variant of FLUX, a 12 billion parameter flow-matching transformer. It trades a little quality versus the Pro endpoints for open weights, which is why it is the standard base for community LoRAs and fine-tunes. Supports guidance scale and configurable inference steps for quality-versus-speed tuning.
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Pricing

Price per Generation
Per generation€2.00

API Integration

Use our OpenAI-compatible API to integrate FLUX.1 [dev] into your application.

Install
npm install railwail
JavaScript / TypeScript
import railwail from "railwail";

const rw = railwail("YOUR_API_KEY");

const images = await rw.run("flux-1-dev", "A beautiful sunset over Tokyo");
console.log(images[0].url);

// Or use the image() method for full control
const res = await rw.image("flux-1-dev", "A cat in space", {
  size: "1024x1024",
  n: 1,
});
console.log(res.data[0].url);
Specifications
Price
€2.00
Developer
Black Forest Labs
Category
Image Generation
Supported Formats
text
Tags
replicate
flux
black-forest-labs
text-to-image
open-weights
flagship

Frequently asked questions

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