fix: GPT Image 1.5 aspect ratio and parameters

- Replace invalid 'size' param with 'aspect_ratio' (1:1, 2:3, 3:2)
- Remove unsupported 'low' quality option (only medium, high)
- Remove unsupported 'seed' parameter
- Change default aspect_ratio from 1:1 to 3:2 (landscape)

Fixes issue where horizontal images were being generated as 1:1.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/api/generate/route.ts

@@ -1259,10 +1259,11 @@ async function generateWithFalQueue(
 function getKieModelDefaults(modelId: string): Record<string, unknown> {
   switch (modelId) {
     // GPT Image models require aspect_ratio and quality
+    // Only supports: 1:1, 2:3, 3:2 (default 3:2 = landscape)
     case "gpt-image/1.5-text-to-image":
     case "gpt-image/1.5-image-to-image":
       return {
-        aspect_ratio: "1:1",
+        aspect_ratio: "3:2",
         quality: "medium",
       };
 

src/app/api/models/[modelId]/route.ts

@@ -527,17 +527,15 @@ function getKieSchema(modelId: string): ExtractedSchema {
     },
     "gpt-image/1.5-text-to-image": {
       parameters: [
-        { name: "size", type: "string", description: "Output size", enum: ["1024x1024", "1536x1024", "1024x1536", "auto"], default: "1024x1024" },
-        { name: "quality", type: "string", description: "Output quality", enum: ["low", "medium", "high"], default: "medium" },
-        { name: "seed", type: "integer", description: "Random seed for reproducibility", minimum: 0 },
+        { name: "aspect_ratio", type: "string", description: "Output aspect ratio", enum: ["1:1", "2:3", "3:2"], default: "3:2" },
+        { name: "quality", type: "string", description: "Output quality", enum: ["medium", "high"], default: "medium" },
       ],
       inputs: [{ name: "prompt", type: "text", required: true, label: "Prompt" }],
     },
     "gpt-image/1.5-image-to-image": {
       parameters: [
-        { name: "size", type: "string", description: "Output size", enum: ["1024x1024", "1536x1024", "1024x1536", "auto"], default: "auto" },
-        { name: "quality", type: "string", description: "Output quality", enum: ["low", "medium", "high"], default: "medium" },
-        { name: "seed", type: "integer", description: "Random seed for reproducibility", minimum: 0 },
+        { name: "aspect_ratio", type: "string", description: "Output aspect ratio", enum: ["1:1", "2:3", "3:2"], default: "3:2" },
+        { name: "quality", type: "string", description: "Output quality", enum: ["medium", "high"], default: "medium" },
       ],
       inputs: [
         { name: "prompt", type: "text", required: true, label: "Prompt" },