diff --git a/pyproject.toml b/pyproject.toml
index 6f4146a..03769be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "llm-chat"
-version = "1.1.2"
+version = "1.1.3"
 description = "A general CLI interface for large language models."
 authors = ["Paul Harrison <paul@harrison.sh>"]
 readme = "README.md"
diff --git a/src/llm_chat/chat.py b/src/llm_chat/chat.py
index 5247b90..d10a941 100644
--- a/src/llm_chat/chat.py
+++ b/src/llm_chat/chat.py
@@ -1,3 +1,4 @@
+import math
 from datetime import datetime
 from enum import StrEnum, auto
 from pathlib import Path
@@ -177,13 +178,14 @@ class Chat:
         """Calculate the cost of a request."""
         self.conversation.completion_tokens += usage.completion_tokens
         self.conversation.prompt_tokens += usage.prompt_tokens
-        self.conversation.cost = round(
-            (self.conversation.completion_tokens / 1000)
-            * self._pricing[self.settings.model][Token.COMPLETION]
-            + (self.conversation.prompt_tokens / 1000)
-            * self._pricing[self.settings.model][Token.PROMPT],
-            6,
-        )
+        self.conversation.cost = math.floor(
+            1000000 * (
+                (self.conversation.completion_tokens / 1000)
+                * self._pricing[self.settings.model][Token.COMPLETION]
+                + (self.conversation.prompt_tokens / 1000)
+                * self._pricing[self.settings.model][Token.PROMPT]
+            )
+        ) / 1000000
 
     def save(self) -> None:
         """Save the conversation to the history directory."""
diff --git a/tests/test_chat.py b/tests/test_chat.py
index 2424134..76a5efd 100644
--- a/tests/test_chat.py
+++ b/tests/test_chat.py
@@ -116,7 +116,7 @@ def test_send_message() -> None:
         assert response == "Hello!"
 
 
-@pytest.mark.parametrize("model,cost", [(Model.GPT3, 0.000043), (Model.GPT4, 0.00105)])
+@pytest.mark.parametrize("model,cost", [(Model.GPT3, round(0.000027, 6)), (Model.GPT4, 0.00105)])
 def test_calculate_cost(model: Model, cost: float) -> None:
     with patch("llm_chat.chat.Chat._make_request") as mock_make_request:
         mock_make_request.return_value = ChatCompletion(