diff --git a/cookbook/azure/README.md b/cookbook/azure/README.md
index 52fb01ade..da100b63b 100644
--- a/cookbook/azure/README.md
+++ b/cookbook/azure/README.md
@@ -15,7 +15,7 @@ MARVIN_AZURE_OPENAI_API_KEY=<your-api-key>
 MARVIN_AZURE_OPENAI_ENDPOINT="https://<your-endpoint>.openai.azure.com/"
 MARVIN_AZURE_OPENAI_API_VERSION=2023-12-01-preview # or latest
 
-MARVIN_CHAT_COMPLETION_MODEL=<your azure openai deployment name>
+MARVIN_CHAT_COMPLETIONS_MODEL=<your azure openai deployment name>
 ```
 
 Note that the chat completion model must be your Azure OpenAI deployment name.
diff --git a/cookbook/azure/usage.py b/cookbook/azure/usage.py
index 4a622e9bb..31fd1de0c 100644
--- a/cookbook/azure/usage.py
+++ b/cookbook/azure/usage.py
@@ -10,7 +10,7 @@
 MARVIN_AZURE_OPENAI_API_VERSION=2023-12-01-preview # or latest
 
 Note that you MUST set the LLM model name to be your Azure OpenAI deployment name, e.g.
-MARVIN_CHAT_COMPLETION_MODEL=<your Azure OpenAI deployment name>
+MARVIN_CHAT_COMPLETIONS_MODEL=<your Azure OpenAI deployment name>
 ```
 """
 
diff --git a/docs/docs/configuration/settings.md b/docs/docs/configuration/settings.md
index b5515f066..d940add49 100644
--- a/docs/docs/configuration/settings.md
+++ b/docs/docs/configuration/settings.md
@@ -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-4'
     ```
 
 ## Settings for using Azure OpenAI models
@@ -38,7 +38,7 @@ MARVIN_AZURE_OPENAI_API_KEY=<your-api-key>
 MARVIN_AZURE_OPENAI_ENDPOINT="https://<your-endpoint>.openai.azure.com/"
 MARVIN_AZURE_OPENAI_API_VERSION=2023-12-01-preview # or latest
 
-MARVIN_CHAT_COMPLETION_MODEL=<your azure openai deployment name>
+MARVIN_CHAT_COMPLETIONS_MODEL=<your azure openai deployment name>
 ```
 
 Note that the chat completion model must be your Azure OpenAI deployment name.
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 4b4e173ec..995ca9ac8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -98,8 +98,8 @@ filterwarnings = [
 env = [
     "MARVIN_TEST_MODE=1",
     # use 3.5 for tests by default
-    'D:MARVIN_CHAT_COMPLETION_MODEL=gpt-3.5-turbo',
-    'D:MARVIN_CHAT_COMPLETION_TEMPERATURE=0.0',
+    'D:MARVIN_CHAT_COMPLETIONS_MODEL=gpt-3.5-turbo',
+    'D:MARVIN_CHAT_COMPLETIONS_TEMPERATURE=0.0',
     'D:MARVIN_LOG_VERBOSE=1',
     'D:MARVIN_LOG_LEVEL=DEBUG',
     'PYTEST_TIMEOUT=20',
diff --git a/src/marvin/settings.py b/src/marvin/settings.py
index 8574de4fb..7074b5642 100644
--- a/src/marvin/settings.py
+++ b/src/marvin/settings.py
@@ -33,7 +33,7 @@ def __setattr__(self, name: str, value: Any) -> None:
 
 
 class ChatCompletionSettings(MarvinSettings):
-    model_config = SettingsConfigDict(env_prefix="marvin_chat_completion_")
+    model_config = SettingsConfigDict(env_prefix="marvin_chat_completions_")
     model: str = Field(
         description="The default chat model to use.", default="gpt-4-1106-preview"
     )
diff --git a/src/marvin/utilities/openai.py b/src/marvin/utilities/openai.py
index 90623c790..f4189dee9 100644
--- a/src/marvin/utilities/openai.py
+++ b/src/marvin/utilities/openai.py
@@ -75,7 +75,7 @@ def get_openai_client(
                     - MARVIN_AZURE_OPENAI_ENDPOINT
                     
                 In addition, you must set the LLM model name to your Azure OpenAI deployment name, e.g.
-                    - MARVIN_CHAT_COMPLETION_MODEL = <your Azure OpenAI deployment name>
+                    - MARVIN_CHAT_COMPLETIONS_MODEL = <your Azure OpenAI deployment name>
                 """
                 )
             )