Black Forest Labs: FLUX.1 Kontext [dev]

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FLUX.1 Kontext Dev is an open-weight 12B parameter model for in-context image generation and editing, allowing prompting with both text and images to modify visual concepts. It was the first open model to deliver proprietary-level image editing performance and runs on consumer hardware.

Cost Per Image $0.025

per generation

Configuration 1MP

resolution

Release Date Jun 12, 2025

 

Code Example

Add AI to your app with the Puter.js AI API — no API keys or setup required.

// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';

puter.ai.txt2img("A serene mountain landscape at sunset").then(image => {
    document.body.appendChild(image);
});

<html>
<body>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ai.txt2img("A serene mountain landscape at sunset").then(image => {
            document.body.appendChild(image);
        });
    </script>
</body>
</html>

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FLUX.2 [klein] 4B

FLUX.2 Klein 4B is a compact, Apache 2.0 licensed model distilled from the full FLUX.2 architecture, capable of sub-second image generation on consumer GPUs with ~13GB VRAM. It supports text-to-image, image editing, and multi-reference generation in a unified model.

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FLUX.2 [klein] 9B

FLUX.2 Klein 9B is a larger variant of the Klein family built on a 9B flow model with an 8B Qwen3 text embedder, matching or exceeding models 5x its size in quality. It offers higher output diversity than the 4B distilled variant and is ideal for fine-tuning and research.

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FLUX.1 Kontext [max]

FLUX.1 Kontext Max is the highest-quality model in the Kontext series, optimized for iteratively modifying existing images via text prompts with maximum fidelity. It offers the best editing consistency and prompt following among Kontext variants.

Frequently Asked Questions

How do I use FLUX.1 Kontext [dev]?

You can access FLUX.1 Kontext [dev] by Black Forest Labs through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required.

Is FLUX.1 Kontext [dev] free?

Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add FLUX.1 Kontext [dev] to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.

What is the pricing for FLUX.1 Kontext [dev]?
FLUX.1 Kontext [dev] costs $0.025 per image.
Price
Per image$0.025
Who created FLUX.1 Kontext [dev]?

FLUX.1 Kontext [dev] was created by Black Forest Labs and released on Jun 12, 2025.

Does it work with React / Vue / Vanilla JS / Node / etc.?

Yes — the FLUX.1 Kontext [dev] API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.

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