Image

Flux Kontext Pro image

Flux Kontext Pro — text-to-image with optional in-context editing from 1 reference. Ratios up to 21:9.

Category: Create · flux-kontext-pro

Capabilities

What this model supports, straight from the schema — no pricing, no infrastructure detail.

Capability	Value
`image_edit` Image edit	Yes
`create_image` Text-to-image	Yes
`max_prompt_length` Max prompt length	2000
`max_reference_images` Max reference images	1

Parameters

Fields accepted in params (or first-class, where applicable) for POST /generations.

Name	Label	Type	Required	Default	Options	Min / Max
`prompt`	Prompt	textarea	Required	—	—	—
`size`	Size	select	Optional	1:1	1:1 · 4:3 · 3:4 · 16:9 · 9:16 · 21:9 · 9:21	—
`output_format`	Output format	select	Optional	png	png · jpg	—
`image_urls`	Optional reference (1)	multi_select	Optional	—	—	— – 1

Example request

bash

curl -X POST https://caranguejo.art/api/v1/dev/generations \
  -H "Authorization: Bearer $CK" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "flux-kontext-pro",
  "prompt": "a neon crab on a beach at sunset, cinematic style",
  "params": {
    "size": "1:1",
    "output_format": "png",
    "image_urls": [
      "https://media.caranguejo.art/inputs/example.png"
    ]
  }
}'

javascript

const res = await fetch("https://caranguejo.art/api/v1/dev/generations", {
  method: "POST",
  headers: {
    "Authorization": "Bearer " + process.env.CK,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "flux-kontext-pro",
    "prompt": "a neon crab on a beach at sunset, cinematic style",
    "params": {
      "size": "1:1",
      "output_format": "png",
      "image_urls": [
        "https://media.caranguejo.art/inputs/example.png"
      ]
    }
  }),
});
const { data } = await res.json();

Example response

json

{
  "id": "9f0c1a7e-…",
  "object": "generation",
  "model": "flux-kontext-pro",
  "type": "image",
  "status": "completed",
  "credits_charged": 40,
  "output": {
    "assets": [
      {
        "url": "https://media.caranguejo.art/outputs/example.png",
        "type": "image"
      }
    ],
    "images": [
      {
        "url": "https://media.caranguejo.art/outputs/example.png"
      }
    ]
  }
}

The job's real cost is returned as credits_charged on the completed response — check GET /balance for the account balance.

Common errors for this job type:

`insufficient_credits`	Account balance can't cover the job cost.
`content_policy_violation`	Prompt or media rejected by content policy.
`generation_timeout`	The job exceeded the maximum processing time.
`rate_limited`	Too many requests per minute.
`invalid_input`	A required parameter is missing or outside the model's schema.
`generation_failed`	Generic processing failure.