diff --git a/aider/models/model.py b/aider/models/model.py
index 4b3397a50..3781d0770 100644
--- a/aider/models/model.py
+++ b/aider/models/model.py
@@ -1,7 +1,6 @@
-import importlib
-
 saved_openai = None
 
+
 class Model:
     name = None
     edit_format = None
diff --git a/aider/models/openrouter.py b/aider/models/openrouter.py
index 7250a521a..97802702f 100644
--- a/aider/models/openrouter.py
+++ b/aider/models/openrouter.py
@@ -18,6 +18,7 @@ class OpenRouterModel(Model):
         # TODO: figure out proper encodings for non openai models
         self.tokenizer = tiktoken.get_encoding("cl100k_base")
 
+        # TODO cache the model list data to speed up using multiple models
         available_models = openai.Model.list().data
         found = next((details for details in available_models if details.get('id') == name), None)
 
@@ -30,6 +31,7 @@ class OpenRouterModel(Model):
             raise ValueError(f'invalid openrouter model: {name}')
 
 
+# TODO run benchmarks and figure out which models support which edit-formats
 def edit_format_for_model(name):
     if any(str in name for str in ['gpt-4', 'claude-2']):
         return "diff"