diff --git a/python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py b/python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py
index ca652d6580c5..e973862dfe91 100644
--- a/python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py
+++ b/python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py
@@ -982,6 +982,7 @@ class OpenAIChatCompletionClient(BaseOpenAIChatCompletionClient, Component[OpenA
         temperature (optional, float):
         top_p (optional, float):
         user (optional, str):
+        default_headers (optional, dict[str, str]):  Custom headers; useful for authentication or other custom requirements.
 
 
     To use this client, you must install the `openai` extension:
@@ -1116,6 +1117,8 @@ class AzureOpenAIChatCompletionClient(
         temperature (optional, float):
         top_p (optional, float):
         user (optional, str):
+        default_headers (optional, dict[str, str]):  Custom headers; useful for authentication or other custom requirements.
+
 
 
     To use this client, you must install the `azure` and `openai` extensions:
diff --git a/python/packages/autogen-ext/src/autogen_ext/models/openai/config/__init__.py b/python/packages/autogen-ext/src/autogen_ext/models/openai/config/__init__.py
index a6b484780212..367564187990 100644
--- a/python/packages/autogen-ext/src/autogen_ext/models/openai/config/__init__.py
+++ b/python/packages/autogen-ext/src/autogen_ext/models/openai/config/__init__.py
@@ -35,6 +35,7 @@ class BaseOpenAIClientConfiguration(CreateArguments, total=False):
     model_capabilities: ModelCapabilities  # type: ignore
     model_info: ModelInfo
     """What functionality the model supports, determined by default from model name but is overriden if value passed."""
+    default_headers: Dict[str, str] | None
 
 
 # See OpenAI docs for explanation of these parameters
@@ -74,6 +75,7 @@ class BaseOpenAIClientConfigurationConfigModel(CreateArgumentsConfigModel):
     max_retries: int | None = None
     model_capabilities: ModelCapabilities | None = None  # type: ignore
     model_info: ModelInfo | None = None
+    default_headers: Dict[str, str] | None = None
 
 
 # See OpenAI docs for explanation of these parameters