diff --git a/aider/coders/chat_chunks.py b/aider/coders/chat_chunks.py
index 9d1360604..3c3673ee6 100644
--- a/aider/coders/chat_chunks.py
+++ b/aider/coders/chat_chunks.py
@@ -51,3 +51,10 @@ class ChatChunks:
         content["cache_control"] = {"type": "ephemeral"}
 
         messages[-1]["content"] = [content]
+
+    def cacheable_messages(self):
+        chunks = self.system + self.examples + self.readonly_files + self.repo + self.done + self.chat_files
+        for i, message in enumerate(reversed(chunks)):
+            if isinstance(message.get('content'), list) and message['content'][0].get('cache_control'):
+                return chunks[:len(chunks)-i]
+        return chunks