diff --git a/src/main/java/com/google/genai/ApiClient.java b/src/main/java/com/google/genai/ApiClient.java
index 0e5bbc384df..22448bce54e 100644
--- a/src/main/java/com/google/genai/ApiClient.java
+++ b/src/main/java/com/google/genai/ApiClient.java
@@ -438,6 +438,7 @@ protected Request buildRequest(
 
     requestHttpOptions.ifPresent(
         httpOptions -> {
+          requestBuilder.tag(HttpOptions.class, httpOptions);
           if (httpOptions.retryOptions().isPresent()) {
             requestBuilder.tag(HttpRetryOptions.class, mergedHttpOptions.retryOptions().get());
           }
diff --git a/src/main/java/com/google/genai/HttpApiClient.java b/src/main/java/com/google/genai/HttpApiClient.java
index 1d253ff24fb..fcc8a887f11 100644
--- a/src/main/java/com/google/genai/HttpApiClient.java
+++ b/src/main/java/com/google/genai/HttpApiClient.java
@@ -22,10 +22,12 @@
 import com.google.genai.types.ClientOptions;
 import com.google.genai.types.HttpOptions;
 import java.io.IOException;
+import java.time.Duration;
 import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
 import okhttp3.Call;
 import okhttp3.Callback;
+import okhttp3.OkHttpClient;
 import okhttp3.Request;
 import okhttp3.Response;
 
@@ -78,7 +80,16 @@ public HttpApiResponse request(
   /** Executes the given HTTP request. */
   private HttpApiResponse executeRequest(Request request) {
     try {
-      return new HttpApiResponse(httpClient.newCall(request).execute());
+      OkHttpClient client = httpClient;
+      HttpOptions requestOptions = request.tag(HttpOptions.class);
+      if (requestOptions != null && requestOptions.timeout().isPresent()) {
+        client =
+            httpClient
+                .newBuilder()
+                .callTimeout(Duration.ofMillis(requestOptions.timeout().get()))
+                .build();
+      }
+      return new HttpApiResponse(client.newCall(request).execute());
     } catch (IOException e) {
       throw new GenAiIOException("Failed to execute HTTP request.", e);
     }
@@ -114,7 +125,17 @@ public CompletableFuture<ApiResponse> asyncRequest(
   private CompletableFuture<ApiResponse> asyncExecuteRequest(Request request) {
     CompletableFuture<ApiResponse> future = new CompletableFuture<>();
 
-    httpClient
+    OkHttpClient client = httpClient;
+    HttpOptions requestOptions = request.tag(HttpOptions.class);
+    if (requestOptions != null && requestOptions.timeout().isPresent()) {
+      client =
+          httpClient
+              .newBuilder()
+              .callTimeout(Duration.ofMillis(requestOptions.timeout().get()))
+              .build();
+    }
+
+    client
         .newCall(request)
         .enqueue(
             new Callback() {
diff --git a/src/test/java/com/google/genai/HttpApiClientTest.java b/src/test/java/com/google/genai/HttpApiClientTest.java
index 8ca839655e0..5b28bf0fa2b 100644
--- a/src/test/java/com/google/genai/HttpApiClientTest.java
+++ b/src/test/java/com/google/genai/HttpApiClientTest.java
@@ -222,6 +222,31 @@ public void testRequestWithHttpOptions() throws Exception {
     assertEquals("header", capturedRequest.header("test"));
   }
 
+  @Test
+  public void testRequestWithHttpOptions_overrideTimeout() throws Exception {
+    // Arrange
+    HttpApiClient client =
+        new HttpApiClient(Optional.of(API_KEY), Optional.empty(), Optional.empty());
+    setMockClient(client);
+
+    okhttp3.OkHttpClient.Builder mockBuilder = Mockito.mock(okhttp3.OkHttpClient.Builder.class);
+    when(mockHttpClient.newBuilder()).thenReturn(mockBuilder);
+    when(mockBuilder.callTimeout(any(java.time.Duration.class))).thenReturn(mockBuilder);
+    when(mockBuilder.build()).thenReturn(mockHttpClient);
+
+    Optional<HttpOptions> requestOptions =
+        Optional.of(HttpOptions.builder().timeout(30000).build());
+
+    // Act
+    client.request("POST", TEST_PATH, TEST_REQUEST_JSON, requestOptions);
+
+    // Assert
+    verify(mockHttpClient).newBuilder();
+    verify(mockBuilder).callTimeout(java.time.Duration.ofMillis(30000));
+    verify(mockBuilder).build();
+    verify(mockHttpClient).newCall(any(okhttp3.Request.class));
+  }
+
   @Test
   public void testRequestWithHttpOptions_extraBody_addNewKey() throws Exception {
     // Arrange