Flux Kontext Max

Image generationNewAvailable
by Black Forest LabsModel ID: flux-kontext-max

A premium text-based image editing model that delivers maximum performance and improved typography generation for transforming images through natural language prompts

Price
US$0.096/image
Aspect ratios
1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 4:5, 5:4, 21:9, 9:21, 2:1, 1:2
Input โ†’ output
Text โ†’ Image
Developer
Black Forest Labs
Updated
24 September 2026
01

Playground

Try Flux Kontext Max

Input & output

US$0.096/image
Try Flux Kontext Max
Advanced settings (1)
Output
Your image appears here.

This run

US$0.096 ยท 9.6 credits

For accounts without a purchase: runs above 2 credits need a top-up.

New here?

10 free credits (US$0.10) when you sign up with Google

Usable 24 hours after sign-up, up to 5 runs per day and at most 2 credits per run. Other sign-in methods start without credits.

02

Examples

Real outputs from the public examples of this model on Replicate, with the prompt and settings that produced them. They were not generated live on this page.
  • Example output 1 from Flux Kontext Max: Make the letters 3D, floating in space on a city streetOpen full size
    InputInput

    Prompt

    Make the letters 3D, floating in space on a city street

    Settings

    aspect_ratio
    match_input_image
  • Example output 2 from Flux Kontext Max: Using this style, a bunny, a dog and a cat are having a tea party seated around a small white tableOpen full size
    InputInput

    Prompt

    Using this style, a bunny, a dog and a cat are having a tea party seated around a small white table

    Settings

    aspect_ratio
    match_input_image
  • Example output 3 from Flux Kontext Max: Using this style, a bunny, a dog and a cat are having a tea party seated around a small white tableOpen full size
    InputInput

    Prompt

    Using this style, a bunny, a dog and a cat are having a tea party seated around a small white table

    Settings

    aspect_ratio
    match_input_image
03

About Flux Kontext Max

TL;DRAs of 24 September 2026

Flux Kontext Max is a model by Black Forest Labs in the Image generation category. On Railwail, Flux Kontext Max costs US$0.096 per image. Supported aspect ratios: 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 4:5, 5:4, 21:9, 9:21, 2:1 and 1:2.

04

Pricing

Prices in US dollars. Usage is charged from prepaid credits.
Per imageUS$0.096 per image
  • 1 credit = US$0.01

Cost calculator

Price calculator

Total

US$9.60

960 credits

Per run

US$0.096 ยท 9.6 credits

Fixed price per run, known before the run starts.

05

API

Call Flux Kontext Max with your Railwail API key. Use this model ID in the request:
curl https://railwail.com/api/v1/images/generations \
  -H "Authorization: Bearer $RAILWAIL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "flux-kontext-max",
    "prompt": "A lighthouse on a rocky coast at sunset, photorealistic"
  }'
Set your key as RAILWAIL_API_KEYCreate API key
06

Specifications

Model ID
flux-kontext-max
Input
Text
Output
Image
Aspect ratios
1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 4:5, 5:4, 21:9, 9:21, 2:1, 1:2
Billing
Fixed price, known before the run
Catalog entry updated
24 September 2026

Input parameters

Inputs and settings from the model's input schema. The example in the API section shows which of them the API accepts.

  • promptrequired
    Type: Text
    Default: โ€“
    Allowed values: โ€“
  • aspectRatio
    Type: Choice
    Default: 1:1
    Allowed values: match_input_image, 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 4:5, 5:4, 21:9, 9:21, 2:1 or 1:2

Tags

  • replicate
  • black-forest-labs
  • text-to-image
07

Use cases

08

Frequently asked questions

What is Flux Kontext Max?

Flux Kontext Max is a model by Black Forest Labs in the Image generation category. On Railwail you can call it with an API key through the Railwail API.

How much does Flux Kontext Max cost on Railwail?

On Railwail, Flux Kontext Max costs US$0.096 per image. The price is known before the run starts. Usage is paid from prepaid credits; 1 credit equals US$0.01.

Which settings does Flux Kontext Max support?

According to its input schema, Flux Kontext Max knows these parameters: prompt and aspectRatio (match_input_image, 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 4:5, 5:4, 21:9, 9:21, 2:1 or 1:2).

How fast is Flux Kontext Max?

There are not enough measured runs of Flux Kontext Max on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.

Is Flux Kontext Max better than FLUX 1.1 Pro?

That depends on the task. Flux Kontext Max (Black Forest Labs) and FLUX 1.1 Pro (Black Forest Labs) are both models in the Image generation category. The comparison page shows their prices and specifications side by side.

Compare Flux Kontext Max and FLUX 1.1 Pro

How do I use Flux Kontext Max through the API?

Create a Railwail API key and send your request with the model ID flux-kontext-max. Code examples for curl, Python and JavaScript are in the API section of this page.

09

Comparable models

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Use Flux Kontext Max via the API

One API key for every model on Railwail. Usage is charged from prepaid credits, 1 credit = US$0.01.