Maybe now?

api.py

@@ -3,6 +3,7 @@ import sys
 
 import uvicorn
 from fastapi import Body, FastAPI
+from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import FileResponse
 from fastapi.staticfiles import StaticFiles
 from pydantic import BaseModel
@@ -35,6 +36,14 @@ class PredictResponse(BaseModel):
 # --- FastAPI App ---
 app = FastAPI()
 
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
 
 def get_model_for_n(n: int):
     """

ui/script.js

@@ -91,7 +91,7 @@ document.addEventListener("DOMContentLoaded", () => {
       }
     } catch (error) {
       console.error("Prediction failed:", error);
-      status.textContent = "Error";
+      status.textContent = "Error: " + error.message;
     } finally {
       isFetching = false;
       status.textContent = "Idle";