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POST
/
v1
/
images
/
generations
flux-kontext-pro (image edit)
curl --request POST \
  --url https://api.example.com/v1/images/generations
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

ParameterTypeRequiredDefaultDescription
promptstring✅ Yescat with a red hat https://xxx.pngPrompt parameter
modelstring✅ Yesflux-kontext-proThe model to use for the request
sizestring❌ No16:9Size parameter
ninteger❌ No1Number of completions to generate