Image Generation — OneHub

Generate images via Replicate (FLUX) or OpenAI (GPT Image 2).

Docs

Docs Quick Start Authentication SDK Setup Available Models Rate Limits Chat Completions Streaming List Models Embeddings Image Generation Text to Speech Speech to Text Billing & Wallet Webhooks Errors

Image Generation

POST https://www.onehub.design/v1/images/generations

Request

curl https://www.onehub.design/v1/images/generations \
  -H "Authorization: Bearer sk-onehub-xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "bfl/flux-2-klein-4b",
    "prompt": "A futuristic city at sunset, cinematic"
  }'

Response

{
  "created": 1730000000,
  "data": [
    {
      "url": "https://replicate.delivery/pbxt/abc123.png"
    }
  ]
}

Parameters

Field	Type	Description
`model`	string	`bfl/flux-2-klein-4b` or `openai/gpt-image-2`
`prompt`	string	Text prompt describing the image
`size`	string	e.g. `1024x1024`, `1024x1536` (model-dependent)
`n`	number	Number of images to generate (1–4, model-dependent)
`quality`	string	e.g. `standard` or `high` (GPT Image 2)