diff --git a/models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiChatModel.java b/models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiChatModel.java
index c6631897c11..a251a4a82fc 100644
--- a/models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiChatModel.java
+++ b/models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiChatModel.java
@@ -652,7 +652,8 @@ else if (message.getMessageType() == MessageType.TOOL) {
 		List<ToolDefinition> toolDefinitions = this.toolCallingManager.resolveToolDefinitions(requestOptions);
 		if (!CollectionUtils.isEmpty(toolDefinitions)) {
 			request = ModelOptionsUtils.merge(
-					OpenAiChatOptions.builder().tools(this.getFunctionTools(toolDefinitions)).build(), request,
+					OpenAiChatOptions.builder().tools(this.getFunctionTools(toolDefinitions))
+							.extraBody(request.extraBody()).build(), request,
 					ChatCompletionRequest.class);
 		}
 
diff --git a/models/spring-ai-openai/src/test/java/org/springframework/ai/openai/OpenAiChatModelTest.java b/models/spring-ai-openai/src/test/java/org/springframework/ai/openai/OpenAiChatModelTest.java
new file mode 100644
index 00000000000..c5c116718db
--- /dev/null
+++ b/models/spring-ai-openai/src/test/java/org/springframework/ai/openai/OpenAiChatModelTest.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2023-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.ai.openai;
+
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.ai.chat.prompt.Prompt;
+import org.springframework.ai.model.SimpleApiKey;
+import org.springframework.ai.openai.api.OpenAiApi;
+import org.springframework.ai.tool.ToolCallback;
+import org.springframework.ai.tool.function.FunctionToolCallback;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class OpenAiChatModelTest {
+
+	@Test
+	void testCreateRequest() {
+		ToolCallback toolCallback = FunctionToolCallback.builder("sayHello", str -> "Hello " + str)
+			.description("Say hello")
+			.inputType(String.class)
+			.build();
+
+		OpenAiChatOptions runtimeOptions = OpenAiChatOptions.builder()
+			.internalToolExecutionEnabled(false)
+			.toolCallbacks(toolCallback)
+			.extraBody(Map.of("chat_template_kwargs", Map.of("enable_thinking", false)))
+			.build();
+		OpenAiChatModel chatModel = OpenAiChatModel.builder()
+			.openAiApi(OpenAiApi.builder().apiKey(new SimpleApiKey("TEST")).build())
+			.build();
+		Prompt prompt = new Prompt("Test message content", runtimeOptions);
+		OpenAiApi.ChatCompletionRequest request = chatModel.createRequest(prompt, false);
+
+		assertThat(request.extraBody()).isNotNull();
+		assertThat(request.extraBody()).isNotEmpty();
+		assertThat(request.extraBody().size()).isEqualTo(1);
+		assertThat(request.extraBody().containsKey("chat_template_kwargs")).isTrue();
+		assertThat(((Map<String, Object>) request.extraBody().get("chat_template_kwargs"))).isNotNull();
+		assertThat(
+				((Map<String, Object>) request.extraBody().get("chat_template_kwargs")).containsKey("enable_thinking"))
+			.isTrue();
+		assertThat(((Map<String, Object>) request.extraBody().get("chat_template_kwargs")).get("enable_thinking"))
+			.isEqualTo(false);
+
+	}
+
+}