Image

FLUX.1 Kontext Max

FLUX.1 Kontext Max is a context-aware image model for editing and text-to-image generation, with predictable per-image pricing and asynchronous task processing.

Context-Aware EditingText to ImageFixed Per-Image Pricing

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Service Highlights

Official Discounts
Pay-as-you-go
Fast & Low Latency

Input

Model

Reference Image

Prompt

Aspect Ratio

Output Format

Seed (optional)

Prompt Upsampling

Content Moderation

Safety Tolerance2

Output

Image link valid for 72 hours

FLUX.1 Kontext Max API Pricing

Transparent pricing with no hidden fees. Pay only for what you use.

Variant	GoldCurrent price	Platinum	Diamond	Official	Your savings
`flux-kontext-max`	0.64Credits(~$0.064)/pic	0.608Credits(~$0.0608)/pic	0.576Credits(~$0.0576)/pic	0.8Credits(~$0.08)/pic	20%

* Actual costs are subject to final output.

FLUX.1 Kontext Max API Features

Editing-first capabilities with predictable controls and one asynchronous workflow

Context-Aware Image Editing

Use natural-language instructions to change a background, object, color, or visual treatment while the model considers the supplied image context.

Up to 4 Reference Images

Supply as many as four public image URLs for composition and identity cues. Multi-reference input is an experimental capability.

9 Aspect Ratios

Choose 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, 21:9, or 9:21 with the size field.

Format and Safety Controls

Choose PNG, JPEG, or WebP output and set safety_tolerance from 0 to 6.

Unified Asynchronous API

Submit with POST /v1/images/generations, then poll GET /v1/tasks/{task_id} until the task completes or fails.

Fixed Per-Image Billing

Each request returns one image at a fixed model price regardless of aspect ratio or reference count. Failed tasks are refunded automatically.

Kontext Max for Editing and Generation

Use flux-kontext-max for image editing and text-to-image generation with a focus on output quality. Each request produces one image; see this page’s pricing details for current prices.

Prompt Enhancement and Repeatable Seeds

Enable prompt_upsampling to expand instructions, or reuse a fixed seed with the same inputs to help reproduce a result.

Where FLUX.1 Kontext Max Fits

Use a reference when visual context matters, or omit it for text-to-image generation

Products, Backgrounds & Objects

Create product variants, replace scenes, or modify selected objects through concise editing instructions.

Character & Style Continuity

Use an existing image as context to help carry character traits or visual style across new edits; results can vary by prompt and source image.

Experimental Multi-Reference Fusion

Combine cues from up to four images for compositions such as placing a subject into another scene or blending visual references.

Text-to-Image Generation

Send a prompt without image_urls to generate a new image with Kontext Max.

Campaign and Social Assets

Edit a core visual into campaign or social-media variations, then select a supported aspect ratio for each placement.

Creative Concept Iteration

Start from an existing image, refine individual elements through text instructions, and explore controlled visual directions across iterations.

Start Using FLUX.1 Kontext Max

Create an account, authenticate, then submit and poll one unified image task

Create an account and add funds

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Generate an API key

Create a key in the dashboard and send it as a Bearer token in the Authorization header.

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Submit and poll the task

POST the request to /v1/images/generations, read data[0].task_id, and poll /v1/tasks/{task_id} until completed or failed.

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FLUX.1 Kontext Max FAQ

Model choice, inputs, controls, billing, and task behavior

What is FLUX.1 Kontext Max?

FLUX.1 Kontext Max is a context-aware image model from Black Forest Labs. It is designed primarily for image editing from text instructions and can also generate images from text alone.

What is the difference between Pro and Max?

flux-kontext-pro and flux-kontext-max both support text-to-image generation and reference-image editing; Max targets higher output quality. Both output approximately 1MP with up to four references. Completion time varies by task and load. See this page’s pricing details for current Max prices.

How is Kontext priced?

Kontext Max is priced using its original price and actual discount; see this page's live pricing details. Each request generates one image, with no surcharge for aspect ratio or reference-image count. Check the task result for the recorded charge.

How many reference images can I send?

You can pass up to four URLs in image_urls. The output and all reference images must stay within 9MP in total. Multiple references are experimental, and every URL must be publicly accessible.

Can I request an exact image size?

Kontext outputs approximately 1MP, and resolution has no effect. width and height are rejected. Use size with one of the nine supported ratios or a WIDTHxHEIGHT pixel string; pixel strings are converted to the nearest supported ratio. Actual 16:9 and 9:16 outputs may differ from the requested ratio by about 4%.

Which formats and seed controls are available?

Use output_format to select png, jpeg, or webp. seed is optional and random by default; reusing a fixed seed with the same inputs can help reproduce a result.

Can Kontext Max rewrite my prompt?

Use prompt_upsampling to control prompt enhancement. Set it to true to enable enhancement or explicitly set it to false to disable prompt rewriting. Review outputs when wording must remain strict.

How do asynchronous tasks, refunds, and public URLs work?

Submit a generation request and poll the returned task_id until completed or failed. Failed tasks are refunded automatically. Reference URLs must be publicly reachable; hosts that block data-center traffic can cause fetching to fail, so use a reliable public URL.

How much does the FLUX.1 Kontext Max API cost?

The Black Forest Labs FLUX.1 Kontext Max API is billed per generated image. The pricing table on this page lists every specification, and the prices shown are Gold member rates (20% off). Platinum and Diamond members save even more, up to 28%, and you only pay for successful requests.

How do I get a FLUX.1 Kontext Max API key?

Sign up for APIMart, open the API Keys page in your dashboard, and create a key. The same key works for the Black Forest Labs FLUX.1 Kontext Max API and every other model on the platform, with pay-as-you-go billing and no subscription.

How do I use the FLUX.1 Kontext Max API, and where are the docs?

Send your APIMart API key as a Bearer token and POST the request to /v1/images/generations with model set to flux-kontext-max, plus your prompt and optional image_urls. Read data[0].task_id from the response and poll /v1/tasks/{task_id} until the task is completed or failed. Full parameters and code examples for the Flux Kontext API are in the APIMart docs (docs.apimart.ai).

Is the FLUX.1 Kontext Max API free?

No. The FLUX.1 Kontext Max API has no free quota on APIMart. It is pay-as-you-go and billed per generated image, failed tasks are refunded automatically, and Gold members get 20% off, with Platinum and Diamond members saving up to 28%. See this page's live pricing table for current Kontext Max prices.

Which Flux API models are available on APIMart?

APIMart offers two Black Forest Labs model families through one Flux API. FLUX.1 Kontext (flux-kontext-pro and flux-kontext-max) focuses on context-aware image editing, while FLUX.2 (flux-2-pro, flux-2-max and flux-2-flex) covers generation and editing with up to 8 reference images. Both use POST /v1/images/generations and the same API key.

How can I contact support for help?

You can reach us via the live chat in the bottom-right corner, email us at [email protected], or join our Discord community. Our team will get back to you as soon as possible.

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