diff --git a/gptcli/assistant.py b/gptcli/assistant.py
index 6adac67..07de4b1 100644
--- a/gptcli/assistant.py
+++ b/gptcli/assistant.py
@@ -56,7 +56,7 @@ class AssistantConfig(TypedDict, total=False):
 
 
 def get_completion_provider(model: str) -> CompletionProvider:
-    if model.startswith("gpt"):
+    if model.startswith("gpt") or model.startswith("ft:gpt"):
         return OpenAICompletionProvider()
     elif model.startswith("claude"):
         return AnthropicCompletionProvider()