OrcaRouter API keys look like sk-orca-.... Pass them in the
Authorization: Bearer sk-orca-... header.
"gpt-image-1"
1 <= x <= 10OpenAI-style size like 1024x1024. For models that use
aspect-ratio instead (Gemini Imagen), OrcaRouter maps
1024x1024 → 1:1, 1792x1024 → 16:9, etc.
"1024x1024"
"1792x1024"
"1024x1792"
auto, standard, hd, high, medium, low vivid, natural url, b64_json