changed gpt-5 to gpt-5-chat-latest, moved api key to top and included message to show api key is not saved

app.py

@@ -180,7 +180,6 @@ def ensure_index_downloaded() -> Path:
         local_dir_use_symlinks=False,
     )
     
-    # --- START OF FIX ---
     # Walk the downloaded directory to find the index files
     downloaded_dir = Path(snapshot_path)
     for root, dirs, files in os.walk(downloaded_dir):
@@ -191,7 +190,6 @@ def ensure_index_downloaded() -> Path:
 
     # If the files are not found, raise an error
     raise FileNotFoundError("FAISS index files (index.faiss and index.pkl) not found in the downloaded dataset.")
-    # --- END OF FIX ---
 
 
 # Keep a lightweight global cache so we don’t reload embeddings on every click
@@ -254,22 +252,14 @@ with gr.Blocks(title="DeepV for RTL (Model-Agnostic)") as demo:
 
     with gr.Row():
         with gr.Column(scale=2):
-            spec = gr.Textbox(
-                label="Design Specification (natural language or I/O contract)",
-                placeholder="e.g., 8-bit UART transmitter with baud rate generator ...",
-                lines=10
-            )
-            with gr.Row():
-                use_rag = gr.Checkbox(value=True, label="Use Retrieval (RAG)")
-                top_k = gr.Slider(1, 10, value=3, step=1, label="Top-K retrieved examples")
-
+            # Moved model choice and API key to the top of the left column
             with gr.Row():
                 model_choice = gr.Dropdown(
                     choices=[
                         "gpt-4o",
                         "gpt-4o-mini",
                         "gpt-4.1",
-                        "gpt-5",
+                        "gpt-5-chat-latest",
                         "gpt-5-mini"
                     ],
                     value="gpt-4o",
@@ -277,6 +267,15 @@ with gr.Blocks(title="DeepV for RTL (Model-Agnostic)") as demo:
                 )
                 api_key = gr.Textbox(label="OpenAI API Key", type="password", placeholder="sk-...")
 
+            spec = gr.Textbox(
+                label="Design Specification (natural language or I/O contract)",
+                placeholder="e.g., 8-bit UART transmitter with baud rate generator ...",
+                lines=10
+            )
+            with gr.Row():
+                use_rag = gr.Checkbox(value=True, label="Use Retrieval (RAG)")
+                top_k = gr.Slider(1, 10, value=3, step=1, label="Top-K retrieved examples")
+
             with gr.Accordion("Generation Settings", open=False):
                 temperature = gr.Slider(0.0, 1.5, value=0.2, step=0.05, label="Temperature")
                 top_p = gr.Slider(0.1, 1.0, value=0.9, step=0.05, label="Top-p")