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 d0a17875875e..bdf3325841f8 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
@@ -1,4 +1,4 @@
-from typing import Awaitable, Callable, Dict, List, Literal, Optional, Union
+from typing import Any, Awaitable, Callable, Dict, List, Literal, Optional, Union
 
 from autogen_core import ComponentModel
 from autogen_core.models import ModelCapabilities, ModelInfo  # type: ignore
@@ -57,6 +57,10 @@ class CreateArguments(TypedDict, total=False):
     - 'low': Faster responses with less reasoning
     - 'medium': Balanced reasoning and speed
     - 'high': More thorough reasoning, may take longer"""
+    extra_body: Optional[Dict[str, Any]]
+    """Additional JSON properties to include in the request body, passed directly to the API.
+    Useful for provider-specific parameters not covered by the standard OpenAI interface
+    (e.g. ``{"enable_thinking": false}`` for some Qwen-compatible endpoints)."""
 
 
 AsyncAzureADTokenProvider = Callable[[], Union[str, Awaitable[str]]]
@@ -108,6 +112,8 @@ class CreateArgumentsConfigModel(BaseModel):
     parallel_tool_calls: bool | None = None
     # Controls the amount of effort the model uses for reasoning (reasoning models only)
     reasoning_effort: Literal["minimal", "low", "medium", "high"] | None = None
+    # Additional JSON properties passed directly to the API request body
+    extra_body: Dict[str, Any] | None = None
 
 
 class BaseOpenAIClientConfigurationConfigModel(CreateArgumentsConfigModel):
diff --git a/python/packages/autogen-ext/tests/models/test_openai_model_client.py b/python/packages/autogen-ext/tests/models/test_openai_model_client.py
index ba79795d1ed7..2ac6a48b9545 100644
--- a/python/packages/autogen-ext/tests/models/test_openai_model_client.py
+++ b/python/packages/autogen-ext/tests/models/test_openai_model_client.py
@@ -3378,3 +3378,46 @@ async def test_reasoning_effort_validation() -> None:
         }
 
         ChatCompletionClient.load_component(config)
+
+
+@pytest.mark.asyncio
+async def test_extra_body_parameter() -> None:
+    """Test that extra_body is preserved through load_component round-trip (fixes #7418)."""
+
+    from autogen_core.models import ChatCompletionClient
+
+    # Test OpenAI client with extra_body via constructor
+    openai_client = OpenAIChatCompletionClient(
+        model="gpt-5",
+        api_key="fake_key",
+        extra_body={"enable_thinking": False},
+    )
+    assert openai_client._create_args["extra_body"] == {"enable_thinking": False}  # pyright: ignore[reportPrivateUsage]
+
+    # Test that extra_body survives load_component round-trip (was silently dropped before)
+    config = {
+        "provider": "OpenAIChatCompletionClient",
+        "config": {
+            "model": "gpt-5",
+            "api_key": "fake_key",
+            "extra_body": {"enable_thinking": False},
+        },
+    }
+    loaded_client = ChatCompletionClient.load_component(config)
+    assert loaded_client._create_args["extra_body"] == {"enable_thinking": False}  # type: ignore[attr-defined] # pyright: ignore[reportPrivateUsage, reportUnknownMemberType, reportAttributeAccessIssue]
+
+    # Test Azure OpenAI client with extra_body via constructor
+    azure_client = AzureOpenAIChatCompletionClient(
+        model="gpt-5",
+        azure_endpoint="fake_endpoint",
+        azure_deployment="gpt-5-2025-08-07",
+        api_version="2025-02-01-preview",
+        api_key="fake_key",
+        extra_body={"reasoning": {"effort": "high"}},
+    )
+    assert azure_client._create_args["extra_body"] == {"reasoning": {"effort": "high"}}  # pyright: ignore[reportPrivateUsage]
+
+    # Test that extra_body survives dump/load cycle
+    dumped = openai_client.dump_component()
+    reloaded = OpenAIChatCompletionClient.load_component(dumped)
+    assert reloaded._create_args["extra_body"] == {"enable_thinking": False}  # pyright: ignore[reportPrivateUsage]