Flux-Kontext-Pro - Image Edit - gptproto

Flux’s GPTProto format for the image edit API.

curl -X POST "https://gptproto.com/v1/images/generations" \
  -H "Authorization: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "prompt": "cat with a red hat https://xxx.png",
  "model": "flux-kontext-pro",
  "size": "16:9",
  "n": 1
}'

{
  "error": {
    "message": "Invalid signature",
    "type": "401"
  }
}

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	✅ Yes	`cat with a red hat https://xxx.png`	Prompt parameter
`model`	string	✅ Yes	`flux-kontext-pro`	The model to use for the request
`size`	string	❌ No	`16:9`	Size parameter
`n`	integer	❌ No	`1`	Number of completions to generate

​Parameters

Parameters