Allow cost estimation on gpt-4-0613 (same as gpt-4-0314).

Author: codeofdusk

src/gptcmd/message.py

@@ -339,7 +339,10 @@ async def asend(self) -> Union[Message, AioMessageStream]:
     def _post_send(self, resp, stream_cls: Type[S]) -> Union[Message, S]:
         "Handles API response objects generated by openai."
         if not self.stream:
-            if resp.model != "gpt-4-0314" and resp.model.startswith("gpt-4"):
+            if resp.model not in (
+                "gpt-4-0314",
+                "gpt-4-0613",
+            ) and resp.model.startswith("gpt-4"):
                 self.prompt_tokens = None
                 self.sampled_tokens = None
             if self.prompt_tokens is not None: