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server.js

@@ -366,11 +366,14 @@ app.post('/api/generate', async (req, res) => {
       ...(flat.seed !== null ? { seed: flat.seed } : {})
     };
 
-    // Minimal payload (some models reject extended fields). Only prompt required.
+    // Minimal payload (some models reject extended fields). Include size/steps/seed for hunyuan-image-3 compatibility
     const variantCMinimal = {
       model: targetModel,
       input_args: {
-        prompt: flat.prompt
+        prompt: flat.prompt,
+        size: `${flat.width}x${flat.height}`,
+        steps: flat.num_inference_steps,
+        ...(flat.seed !== null ? { seed: flat.seed } : {})
       }
     };