FlagshipRouter — Image Generation
Requires FLAGSHIPROUTER_URL (and FLAGSHIPROUTER_KEY if auth enabled). See https://raw.githubusercontent.com/theRizwan/FlagshipRouter/refs/heads/main/skills/flagshiprouter/SKILL.md for setup.
Discover
bashcurl $FLAGSHIPROUTER_URL/v1/models/image | jq '.data[].id' # Per-model params/options (size enum, quality enum, capabilities like edit) curl "$FLAGSHIPROUTER_URL/v1/models/info?id=openai/dall-e-3"
Endpoint
POST $FLAGSHIPROUTER_URL/v1/images/generations
| Field | Required | Notes |
|---|---|---|
model | yes | from /v1/models/image |
prompt | yes | image description |
n | no | count (provider-dependent) |
size | no | 1024x1024, 1792x1024, ... |
quality | no | standard / hd (OpenAI) |
response_format | no | url (default) or b64_json |
Add query ?response_format=binary to receive raw image bytes (handy for saving file).
Examples
Save to file (binary):
bashcurl -X POST "$FLAGSHIPROUTER_URL/v1/images/generations?response_format=binary" \ -H "Authorization: Bearer $FLAGSHIPROUTER_KEY" \ -H "Content-Type: application/json" \ -d '{"model":"gemini/gemini-3-pro-image-preview","prompt":"watercolor mountains at sunrise","size":"1024x1024"}' \ --output out.png
JS (URL response):
jsconst r = await fetch(`${process.env.FLAGSHIPROUTER_URL}/v1/images/generations`, { method: "POST", headers: { "Authorization": `Bearer ${process.env.FLAGSHIPROUTER_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):
json{ "created": 1735000000, "data": [{ "url": "https://..." }] }
response_format=b64_json:
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) |
