add valid models in utils.py

litellm/utils.py

@@ -2603,3 +2603,33 @@ def trim_messages(
     except: # [NON-Blocking, if error occurs just return final_messages
         return messages
 
+
+# this helper reads the .env and returns a list of supported llms for user
+def get_valid_models():
+    try:
+        # get keys set in .env
+        environ_keys = os.environ.keys()
+        valid_providers = []
+        # for all valid providers, make a list of supported llms
+        valid_models = []
+
+        for provider in litellm.provider_list:
+            # edge case litellm has together_ai as a provider, it should be togetherai
+            provider = provider.replace("_", "")
+
+            # litellm standardizes expected provider keys to 
+            # PROVIDER_API_KEY. Example: OPENAI_API_KEY, COHERE_API_KEY
+            expected_provider_key = f"{provider.upper()}_API_KEY"
+            if expected_provider_key in environ_keys:            
+                # key is set 
+                valid_providers.append(provider)
+        
+        for provider in valid_providers:
+            if provider == "azure":
+                valid_models.append("Azure-LLM")
+            else:
+                models_for_provider = litellm.models_by_provider.get(provider, [])
+                valid_models.extend(models_for_provider)
+        return valid_models
+    except:
+        return [] # NON-Blocking