allow longer conversation histories for models with larger context windows

aider/coders/base_coder.py

@@ -189,7 +189,11 @@ class Coder:
         for fname in self.get_inchat_relative_files():
             self.io.tool_output(f"Added {fname} to the chat.")
 
-        self.summarizer = ChatSummary(models.Model.weak_model())
+        self.summarizer = ChatSummary(
+            models.Model.weak_model(),
+            self.main_model.max_chat_history_tokens,
+        )
+
         self.summarizer_thread = None
         self.summarized_done_messages = []
 

aider/models/model.py

@@ -8,6 +8,7 @@ class Model:
     edit_format = None
     max_context_tokens = 0
     tokenizer = None
+    max_chat_history_tokens = 1024
 
     always_available = False
     use_repo_map = False

aider/models/openai.py

@@ -40,12 +40,15 @@ class OpenAIModel(Model):
             if tokens == 8:
                 self.prompt_price = 0.03
                 self.completion_price = 0.06
+                self.max_chat_history_tokens = 1024
             elif tokens == 32:
                 self.prompt_price = 0.06
                 self.completion_price = 0.12
+                self.max_chat_history_tokens = 3 * 1024
             elif tokens == 128:
                 self.prompt_price = 0.01
                 self.completion_price = 0.03
+                self.max_chat_history_tokens = 4 * 1024
 
             return
 
@@ -56,12 +59,15 @@ class OpenAIModel(Model):
             if self.name == "gpt-3.5-turbo-1106":
                 self.prompt_price = 0.001
                 self.completion_price = 0.002
+                self.max_chat_history_tokens = 3 * 1024
             elif tokens == 4:
                 self.prompt_price = 0.0015
                 self.completion_price = 0.002
+                self.max_chat_history_tokens = 1024
             elif tokens == 16:
                 self.prompt_price = 0.003
                 self.completion_price = 0.004
+                self.max_chat_history_tokens = 2 * 1024
 
             return