9Router — Image Generation

Requires NINEROUTER_URL (and NINEROUTER_KEY if auth enabled). See https://raw.githubusercontent.com/decolua/9router/refs/heads/master/skills/9router/SKILL.md for setup.

Discover

curl $NINEROUTER_URL/v1/models/image | jq '.data[].id'
# Per-model params/options (size enum, quality enum, capabilities like edit)
curl "$NINEROUTER_URL/v1/models/info?id=openai/dall-e-3"

Endpoint

POST $NINEROUTER_URL/v1/images/generations

Field	Required	Notes
model	yes	from /v1/models/image
prompt	yes	image description
n	no	count (provider-dependent)
size	no	1024x1024, 1792x1024, ...
quality	no	standard / hd (OpenAI)
response_format	no	url (default) or b64_json

Add query ?response_format=binary to receive raw image bytes (handy for saving file).

Examples

Save to file (binary):

curl -X POST "$NINEROUTER_URL/v1/images/generations?response_format=binary" \
  -H "Authorization: Bearer $NINEROUTER_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"gemini/gemini-3-pro-image-preview","prompt":"watercolor mountains at sunrise","size":"1024x1024"}' \
  --output out.png

JS (URL response):

const r = await fetch(`${process.env.NINEROUTER_URL}/v1/images/generations`, {
  method: "POST",
  headers: { "Authorization": `Bearer ${process.env.NINEROUTER_KEY}`, "Content-Type": "application/json" },
  body: JSON.stringify({ model: "gemini/gemini-3-pro-image-preview", prompt: "neon city", size: "1024x1024" }),
});
const { data } = await r.json();
console.log(data[0].url || data[0].b64_json.slice(0, 40));

Response shape

JSON (default response_format=url):

{ "created": 1735000000, "data": [{ "url": "https://..." }] }

response_format=b64_json:

{ "created": 1735000000, "data": [{ "b64_json": "iVBORw0KGgo..." }] }

Query ?response_format=binary returns raw image bytes (Content-Type image/png or image/jpeg).

Provider quirks

Common fields above work everywhere. These add/override:

Provider	Extra/changed fields	Notes
openai, minimax, openrouter, recraft	quality, style, response_format	Standard OpenAI shape
gemini (nano-banana)	—	Only prompt; ignores size/n
codex (gpt-5.4-image)	image, images[], image_detail, output_format, background	SSE stream; ChatGPT Plus/Pro required
huggingface	—	Only prompt; returns single image
nanobanana	image, images[] (edit mode)	size → aspect ratio; async polling
fal-ai	image (img2img)	n → num_images; size → ratio; async
stability-ai	style (preset), output_format	size → aspect_ratio
black-forest-labs (FLUX)	image (ref)	size → exact width/height; async
runwayml	image (ref)	size → ratio; async; video models exist
sdwebui, comfyui	—	Localhost noAuth (:7860 / :8188)