diff --git a/arch/arch_config_schema.yaml b/arch/arch_config_schema.yaml
index 0ca9d42d..9e9abac8 100644
--- a/arch/arch_config_schema.yaml
+++ b/arch/arch_config_schema.yaml
@@ -76,6 +76,16 @@ properties:
           type: string
         http_host:
           type: string
+        provider_interface:
+          type: string
+          enum:
+            - arch
+            - claude
+            - deepseek
+            - groq
+            - mistral
+            - openai
+            - gemini
         routing_preferences:
           type: array
           items:
diff --git a/arch/tools/cli/config_generator.py b/arch/tools/cli/config_generator.py
index c636813b..56d3869a 100644
--- a/arch/tools/cli/config_generator.py
+++ b/arch/tools/cli/config_generator.py
@@ -122,8 +122,17 @@ def validate_and_render_schema():
         provider = model_name_tokens[0]
         model_id = "/".join(model_name_tokens[1:])
         if provider not in SUPPORTED_PROVIDERS:
+            if (
+                llm_provider.get("base_url", None) is None
+                or llm_provider.get("provider_interface", None) is None
+            ):
+                raise Exception(
+                    f"Must provide base_url and provider_interface for unsupported provider {provider} for model {model_name}. Supported providers are: {', '.join(SUPPORTED_PROVIDERS)}"
+                )
+            provider = llm_provider.get("provider_interface", None)
+        elif llm_provider.get("provider_interface", None) is not None:
             raise Exception(
-                f"Unsupported provider {provider} for model {model_name}. Supported providers are: {', '.join(SUPPORTED_PROVIDERS)}"
+                f"Please provide provider interface as part of model name {model_name} using the format <provider>/<model_id>. For example, use 'openai/gpt-3.5-turbo' instead of 'gpt-3.5-turbo' "
             )
 
         if model_id in model_name_keys:
@@ -181,7 +190,7 @@ def validate_and_render_schema():
             llm_provider["protocol"] = protocol
             llms_with_endpoint.append(llm_provider)
 
-    if len(llms_with_usage) > 0:
+    if len(model_usage_name_keys) > 0:
         routing_llm_provider = config_yaml.get("routing", {}).get("llm_provider", None)
         if routing_llm_provider and routing_llm_provider not in llm_provider_name_set:
             raise Exception(
diff --git a/demos/use_cases/llm_routing/arch_config.yaml b/demos/use_cases/llm_routing/arch_config.yaml
index b49cbb8d..cb3a42e6 100644
--- a/demos/use_cases/llm_routing/arch_config.yaml
+++ b/demos/use_cases/llm_routing/arch_config.yaml
@@ -34,5 +34,9 @@ llm_providers:
   - access_key: $GEMINI_API_KEY
     model: gemini/gemini-1.5-pro-latest
 
+  - model: custom/test-model
+    base_url: http://host.docker.internal:11223
+    provider_interface: openai
+
 tracing:
   random_sampling: 100