diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index 76081a916..d179bcc0d 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -779,8 +779,16 @@ class Coder:
             dict(role="user", content=inp),
         ]
 
+        import datetime
+        from aider.utils import format_messages, format_content
+
         messages = self.format_messages()
 
+        timestamp = datetime.datetime.now().isoformat(timespec='seconds')
+        with open('.aider.llm.history', 'a') as log_file:
+            log_file.write(f"TO LLM {timestamp}\n")
+            log_file.write(format_messages(messages) + "\n")
+
         if self.verbose:
             utils.show_messages(messages, functions=self.functions)
 
@@ -823,6 +831,11 @@ class Coder:
 
         self.io.tool_output()
 
+        timestamp = datetime.datetime.now().isoformat(timespec='seconds')
+        with open('.aider.llm.history', 'a') as log_file:
+            log_file.write(f"LLM RESPONSE {timestamp}\n")
+            log_file.write(format_content("assistant", content) + "\n")
+
         if interrupted:
             content += "\n^C KeyboardInterrupt"
             self.cur_messages += [dict(role="assistant", content=content)]