FLUX.1 Kontext [dev] API

Access FLUX.1 Kontext [dev] AI image generation using Puter.js API.

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Model Card

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

 

API Usage Example

Add FLUX.1 Kontext [dev] image generation to your app with just a few lines of code.
No API keys, no backend, no configuration required.

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

puter.ai.txt2img("A serene mountain landscape at sunset", {
    model: "black-forest-labs/flux.1-kontext-dev"
}).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", {
            model: "black-forest-labs/flux.1-kontext-dev"
        }).then(image => {
            document.body.appendChild(image);
        });
    </script>
</body>
</html>

View full documentation →

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Frequently Asked Questions

What is this FLUX.1 Kontext [dev] API about?

The FLUX.1 Kontext [dev] API gives you access to Black Forest Labs's image generation model through Puter.js. With just a few lines of JavaScript, you can integrate FLUX.1 Kontext [dev] into any web app or Node.js project — no API keys, no backend, and no configuration required.

Who created FLUX.1 Kontext [dev]?

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

How much does the FLUX.1 Kontext [dev] API cost?
The FLUX.1 Kontext [dev] API is available through the User-Pays Model. As a developer, you can add the FLUX.1 Kontext [dev] API to your app for free — your users pay for their own AI costs directly.
Price
Per image$0.025
How do I access the FLUX.1 Kontext [dev] API?

You can access the FLUX.1 Kontext [dev] API with just a few lines of JavaScript — no API keys, no backend, and no configuration required. Include the Puter.js library in your project and start making calls right away. For more details, check out our documentation.

Does the FLUX.1 Kontext [dev] API 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.

Get started with Puter.js

Add FLUX.1 Kontext [dev] image generation to your app without worrying about API keys or setup.

Read the Docs View Tutorials