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 3a164e562..d39572a79 100644
--- a/core/src/main/java/com/google/adk/utils/ModelNameUtils.java
+++ b/core/src/main/java/com/google/adk/utils/ModelNameUtils.java
@@ -7,6 +7,8 @@ public class ModelNameUtils {
   private static final Pattern GEMINI_2_PATTERN = Pattern.compile("^gemini-2\\..*");
   private static final Pattern PATH_PATTERN =
       Pattern.compile("^projects/[^/]+/locations/[^/]+/publishers/[^/]+/models/(.+)$");
+  private static final Pattern APIGEE_PATTERN =
+      Pattern.compile("^apigee/(?:[^/]+/)?(?:[^/]+/)?(.+)$");
 
   public static boolean isGemini2Model(String modelString) {
     if (modelString == null) {
@@ -28,6 +30,10 @@ private static String extractModelName(String modelString) {
     if (matcher.matches()) {
       return matcher.group(1);
     }
+    Matcher apigeeMatcher = APIGEE_PATTERN.matcher(modelString);
+    if (apigeeMatcher.matches()) {
+      return apigeeMatcher.group(1);
+    }
     return modelString;
   }
 
diff --git a/core/src/test/java/com/google/adk/utils/ModelNameUtilsTest.java b/core/src/test/java/com/google/adk/utils/ModelNameUtilsTest.java
new file mode 100644
index 000000000..37853c477
--- /dev/null
+++ b/core/src/test/java/com/google/adk/utils/ModelNameUtilsTest.java
@@ -0,0 +1,72 @@
+package com.google.adk.utils;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class ModelNameUtilsTest {
+
+  @Test
+  public void isGemini2Model_withGemini2Model_returnsTrue() {
+    assertThat(ModelNameUtils.isGemini2Model("gemini-2.5-flash")).isTrue();
+  }
+
+  @Test
+  public void isGemini2Model_withNonGemini2Model_returnsFalse() {
+    assertThat(ModelNameUtils.isGemini2Model("gemini-1.5-pro")).isFalse();
+  }
+
+  @Test
+  public void isGemini2Model_withPathBasedGemini2Model_returnsTrue() {
+    assertThat(
+            ModelNameUtils.isGemini2Model(
+                "projects/test-project/locations/us-central1/publishers/google/models/gemini-2.5-flash"))
+        .isTrue();
+  }
+
+  @Test
+  public void isGemini2Model_withPathBasedNonGemini2Model_returnsFalse() {
+    assertThat(
+            ModelNameUtils.isGemini2Model(
+                "projects/test-project/locations/us-central1/publishers/google/models/gemini-1.5-pro"))
+        .isFalse();
+  }
+
+  @Test
+  public void isGemini2Model_withApigeeGemini2Model_returnsTrue() {
+    assertThat(ModelNameUtils.isGemini2Model("apigee/gemini-2.5-flash")).isTrue();
+  }
+
+  @Test
+  public void isGemini2Model_withApigeeV1Gemini2Model_returnsTrue() {
+    assertThat(ModelNameUtils.isGemini2Model("apigee/v1/gemini-2.5-flash")).isTrue();
+  }
+
+  @Test
+  public void isGemini2Model_withApigeeProviderGemini2Model_returnsTrue() {
+    assertThat(ModelNameUtils.isGemini2Model("apigee/gemini/gemini-2.5-flash")).isTrue();
+  }
+
+  @Test
+  public void isGemini2Model_withApigeeProviderVertexGemini2Model_returnsTrue() {
+    assertThat(ModelNameUtils.isGemini2Model("apigee/vertex_ai/gemini-2.5-flash")).isTrue();
+  }
+
+  @Test
+  public void isGemini2Model_withApigeeProviderV1Gemini2Model_returnsTrue() {
+    assertThat(ModelNameUtils.isGemini2Model("apigee/gemini/v1/gemini-2.5-flash")).isTrue();
+  }
+
+  @Test
+  public void isGemini2Model_withApigeeProviderV1BetaGemini2Model_returnsTrue() {
+    assertThat(ModelNameUtils.isGemini2Model("apigee/vertex_ai/v1beta/gemini-2.5-flash")).isTrue();
+  }
+
+  @Test
+  public void isGemini2Model_withNullModel_returnsFalse() {
+    assertThat(ModelNameUtils.isGemini2Model(null)).isFalse();
+  }
+}