diff --git a/core/src/main/java/com/google/adk/codeexecutors/BuiltInCodeExecutor.java b/core/src/main/java/com/google/adk/codeexecutors/BuiltInCodeExecutor.java
index 972082dde..bd6ae1e32 100644
--- a/core/src/main/java/com/google/adk/codeexecutors/BuiltInCodeExecutor.java
+++ b/core/src/main/java/com/google/adk/codeexecutors/BuiltInCodeExecutor.java
@@ -25,6 +25,7 @@
 import com.google.genai.types.GenerateContentConfig;
 import com.google.genai.types.Tool;
 import com.google.genai.types.ToolCodeExecution;
+import java.util.Optional;
 
 /**
  * A code executor that uses the Model's built-in code executor.
@@ -43,7 +44,7 @@ public CodeExecutionResult executeCode(
   /** Pre-process the LLM request for Gemini 2.0+ models to use the code execution tool. */
   public void processLlmRequest(LlmRequest.Builder llmRequestBuilder) {
     LlmRequest llmRequest = llmRequestBuilder.build();
-    if (ModelNameUtils.isGemini2Model(llmRequest.model().orElse(null))) {
+    if (isBuiltInCodeExecutionSupported(llmRequest.model())) {
       GenerateContentConfig.Builder configBuilder =
           llmRequest.config().map(c -> c.toBuilder()).orElseGet(GenerateContentConfig::builder);
       ImmutableList.Builder<Tool> toolsBuilder = ImmutableList.<Tool>builder();
@@ -56,4 +57,10 @@ public void processLlmRequest(LlmRequest.Builder llmRequestBuilder) {
     throw new IllegalArgumentException(
         "Gemini code execution tool is not supported for model " + llmRequest.model().orElse(""));
   }
+
+  private static boolean isBuiltInCodeExecutionSupported(Optional<String> modelString) {
+    return modelString
+        .map(m -> ModelNameUtils.isGemini2Model(m) || ModelNameUtils.isGemini3Model(m))
+        .orElse(false);
+  }
 }
diff --git a/core/src/main/java/com/google/adk/utils/ModelNameUtils.java b/core/src/main/java/com/google/adk/utils/ModelNameUtils.java
index cf0f2221e..8e2685ab1 100644
--- a/core/src/main/java/com/google/adk/utils/ModelNameUtils.java
+++ b/core/src/main/java/com/google/adk/utils/ModelNameUtils.java
@@ -25,6 +25,7 @@
 public final class ModelNameUtils {
   private static final String GEMINI_PREFIX = "gemini-";
   private static final Pattern GEMINI_2_PATTERN = Pattern.compile("^gemini-2\\..*");
+  private static final Pattern GEMINI_3_PATTERN = Pattern.compile("^gemini-3\\..*");
   private static final String GEMINI_CLASS = "com.google.adk.models.Gemini";
   private static final Pattern PATH_PATTERN =
       Pattern.compile("^projects/[^/]+/locations/[^/]+/publishers/[^/]+/models/(.+)$");
@@ -39,6 +40,10 @@ public static boolean isGemini2Model(String modelString) {
     return matchesModelPattern(modelString, GEMINI_2_PATTERN);
   }
 
+  public static boolean isGemini3Model(String modelString) {
+    return matchesModelPattern(modelString, GEMINI_3_PATTERN);
+  }
+
   private static boolean matchesModelPattern(String modelString, Pattern pattern) {
     if (modelString == null) {
       return false;
diff --git a/core/src/test/java/com/google/adk/utils/ModelNameUtilsTest.java b/core/src/test/java/com/google/adk/utils/ModelNameUtilsTest.java
index 20dda7034..188ef4d32 100644
--- a/core/src/test/java/com/google/adk/utils/ModelNameUtilsTest.java
+++ b/core/src/test/java/com/google/adk/utils/ModelNameUtilsTest.java
@@ -71,6 +71,42 @@ public void isGemini2Model_withNullModel_returnsFalse() {
     assertThat(ModelNameUtils.isGemini2Model(null)).isFalse();
   }
 
+  @Test
+  public void isGemini3Model_withGemini3Model_returnsTrue() {
+    assertThat(ModelNameUtils.isGemini3Model("gemini-3.0-pro")).isTrue();
+  }
+
+  @Test
+  public void isGemini3Model_withNonGemini3Model_returnsFalse() {
+    assertThat(ModelNameUtils.isGemini3Model("gemini-1.5-pro")).isFalse();
+  }
+
+  @Test
+  public void isGemini3Model_withPathBasedGemini3Model_returnsTrue() {
+    assertThat(
+            ModelNameUtils.isGemini3Model(
+                "projects/test-project/locations/us-central1/publishers/google/models/gemini-3.0-flash"))
+        .isTrue();
+  }
+
+  @Test
+  public void isGemini3Model_withPathBasedNonGemini3Model_returnsFalse() {
+    assertThat(
+            ModelNameUtils.isGemini3Model(
+                "projects/test-project/locations/us-central1/publishers/google/models/gemini-1.5-pro"))
+        .isFalse();
+  }
+
+  @Test
+  public void isGemini3Model_withApigeeGemini3Model_returnsTrue() {
+    assertThat(ModelNameUtils.isGemini3Model("apigee/gemini-3.0-flash")).isTrue();
+  }
+
+  @Test
+  public void isGemini3Model_withNullModel_returnsFalse() {
+    assertThat(ModelNameUtils.isGemini3Model(null)).isFalse();
+  }
+
   @Test
   public void isGeminiModel_withGeminiModel_returnsTrue() {
     assertThat(ModelNameUtils.isGeminiModel("gemini-1.5-flash")).isTrue();