diff --git a/reginaldCog/llm_clients/openai_data_models.py b/reginaldCog/llm_clients/openai_data_models.py
index 21ab7c8..171e7c4 100644
--- a/reginaldCog/llm_clients/openai_data_models.py
+++ b/reginaldCog/llm_clients/openai_data_models.py
@@ -23,8 +23,8 @@ class OutputText(Content):
 @dataclass(frozen=True)
 class InputImage(Content):
     type: str = field(init=False, default='input_image')
-    image_url: str = field(default=None)
-    file_id: str = field(default=None)
+    image_url: str | None = field(default=None)
+    file_id: str | None = field(default=None)
 
     def __post_init__(self):
         if self.image_url is None and self.file_id is None: