diff --git a/app.py b/app.py
index d0d4d14..9033bb9 100644
--- a/app.py
+++ b/app.py
@@ -132,6 +132,35 @@ def get_client_for_model(model_name: str):
 def get_openai_client_and_model(
     model_name="adamo1139/Hermes-3-Llama-3.1-8B-FP8-Dynamic",
 ):
+    """Get OpenAI client and model name.
+
+    Supports MODEL_X references (e.g., MODEL_1, MODEL_2, MODEL_3) that map to
+    environment variables MODEL_ENDPOINT_X and MODEL_API_KEY_X.
+    """
+    # Handle MODEL_X references
+    if model_name and model_name.startswith("MODEL_"):
+        try:
+            model_num = model_name.split("_")[1]
+            endpoint_key = f"MODEL_ENDPOINT_{model_num}"
+            api_key_key = f"MODEL_API_KEY_{model_num}"
+            model_name_key = f"MODEL_NAME_{model_num}"
+
+            endpoint = os.environ.get(endpoint_key)
+            api_key = os.environ.get(api_key_key)
+
+            if endpoint and api_key:
+                client = get_client_for_endpoint(endpoint, api_key)
+                # Get the actual model name from environment, or use sensible default
+                actual_model = os.environ.get(model_name_key, "model")
+                return client, actual_model
+            else:
+                print(f"Warning: MODEL_{model_num} not configured ({endpoint_key} or {api_key_key} missing)")
+                # Fall back to default model
+                model_name = "adamo1139/Hermes-3-Llama-3.1-8B-FP8-Dynamic"
+        except Exception as e:
+            print(f"Warning: Failed to load {model_name}: {e}, falling back to default")
+            model_name = "adamo1139/Hermes-3-Llama-3.1-8B-FP8-Dynamic"
+
     return get_client_for_model(model_name), model_name