diff --git a/cookbook/_archive/test_writing_application.py b/cookbook/_archive/test_writing_application.py
index d50d61f7d..354c26f02 100644
--- a/cookbook/_archive/test_writing_application.py
+++ b/cookbook/_archive/test_writing_application.py
@@ -9,7 +9,7 @@
 from pydantic import BaseModel, Field
 
 marvin.settings.log_level = "DEBUG"
-marvin.settings.llm_model = "gpt-4"
+marvin.settings.llm_model = "gpt-4o"
 
 
 class TestWriterState(BaseModel):
diff --git a/cookbook/flows/github_digest/repo_activity.py b/cookbook/flows/github_digest/repo_activity.py
index 1bc3f90f0..2eb2e7379 100644
--- a/cookbook/flows/github_digest/repo_activity.py
+++ b/cookbook/flows/github_digest/repo_activity.py
@@ -164,7 +164,7 @@ async def daily_github_digest(
         contributors_activity=await data_future.result(),
     )
 
-    marvin.settings.openai.chat.completions.model = "gpt-4"
+    marvin.settings.openai.chat.completions.model = "gpt-4o"
 
     epic_story = write_a_tasteful_epic(markdown_digest)
 
diff --git a/docs/docs/configuration/settings.md b/docs/docs/configuration/settings.md
index 70db76ce7..0b5a5766e 100644
--- a/docs/docs/configuration/settings.md
+++ b/docs/docs/configuration/settings.md
@@ -11,7 +11,7 @@ Please set Marvin specific settings in `~/.marvin/.env`. One exception being `OP
     For example, in your `~/.marvin/.env` file you could have:
     ```shell
     MARVIN_LOG_LEVEL=INFO
-    MARVIN_CHAT_COMPLETIONS_MODEL=gpt-4
+    MARVIN_CHAT_COMPLETIONS_MODEL=gpt-4o
     MARVIN_OPENAI_API_KEY='sk-my-api-key'
     ```
     Settings these values will let you avoid setting an API key every time. 
@@ -24,7 +24,7 @@ A runtime settings object is accessible via `marvin.settings` and can be used to
     ```python
     import marvin
 
-    marvin.settings.openai.chat.completions.model = 'gpt-4'
+    marvin.settings.openai.chat.completions.model = 'gpt-4o'
     ```
 
 ## Settings for using Azure OpenAI models
diff --git a/src/marvin/utilities/testing.py b/src/marvin/utilities/testing.py
index 3c313363c..8f0325295 100644
--- a/src/marvin/utilities/testing.py
+++ b/src/marvin/utilities/testing.py
@@ -57,7 +57,7 @@ def assert_equal(
     assert result.is_equal, assert_msg
 
 
-@marvin.fn(model_kwargs=dict(model="gpt-4-1106-preview"))
+@marvin.fn(model_kwargs=dict(model="gpt-4o"))
 def _assert_equal(
     llm_output: Any, expected: Any, instructions: str = None
 ) -> Assertion:
diff --git a/tests/fixtures/llms.py b/tests/fixtures/llms.py
index 345fbf9ee..810c66752 100644
--- a/tests/fixtures/llms.py
+++ b/tests/fixtures/llms.py
@@ -7,5 +7,5 @@ def gpt_4():
     """
     Uses GPT 4 for the duration of the test
     """
-    with temporary_settings(openai__chat__completions__model="gpt-4-1106-preview"):
+    with temporary_settings(openai__chat__completions__model="gpt-4o"):
         yield
diff --git a/tests/test_settings.py b/tests/test_settings.py
index 81dc6b857..f6120aabd 100644
--- a/tests/test_settings.py
+++ b/tests/test_settings.py
@@ -44,7 +44,7 @@ def test_speech_settings_default(self):
 class TestAssistantSettings:
     def test_assistant_settings_default(self):
         settings = AssistantSettings()
-        assert settings.model == "gpt-4-1106-preview"
+        assert settings.model == "gpt-4o"
 
 
 class TestTemporarySettings: