diff --git a/loopgpt/agent.py b/loopgpt/agent.py
index 4c73e30..944960e 100644
--- a/loopgpt/agent.py
+++ b/loopgpt/agent.py
@@ -71,6 +71,8 @@ def __init__(
 
         if model is None:
             model = OpenAIModel("gpt-3.5-turbo")
+        elif isinstance(model, str):
+            model = OpenAIModel(model)
 
         if embedding_provider is None:
             embedding_provider = OpenAIEmbeddingProvider()