diff --git a/src/llama_stack/apis/agents/openai_responses.py b/src/llama_stack/apis/agents/openai_responses.py
index 69e2b2012..553ac16c2 100644
--- a/src/llama_stack/apis/agents/openai_responses.py
+++ b/src/llama_stack/apis/agents/openai_responses.py
@@ -403,7 +403,7 @@ class OpenAIResponseText(BaseModel):
 
 
 # Must match type Literals of OpenAIResponseInputToolWebSearch below
-WebSearchToolTypes = ["web_search", "web_search_preview", "web_search_preview_2025_03_11"]
+WebSearchToolTypes = ["web_search", "web_search_preview", "web_search_preview_2025_03_11", "web_search_2025_08_26"]
 
 
 @json_schema_type
@@ -415,7 +415,7 @@ class OpenAIResponseInputToolWebSearch(BaseModel):
     """
 
     # Must match values of WebSearchToolTypes above
-    type: Literal["web_search"] | Literal["web_search_preview"] | Literal["web_search_preview_2025_03_11"] = (
+    type: Literal["web_search"] | Literal["web_search_preview"] | Literal["web_search_preview_2025_03_11"] | Literal["web_search_2025_08_26"] = (
         "web_search"
     )
     # TODO: actually use search_context_size somewhere...
diff --git a/tests/integration/responses/fixtures/test_cases.py b/tests/integration/responses/fixtures/test_cases.py
index b90dde62f..7ad923c40 100644
--- a/tests/integration/responses/fixtures/test_cases.py
+++ b/tests/integration/responses/fixtures/test_cases.py
@@ -95,6 +95,14 @@ web_search_test_cases = [
         ),
         id="llama_experts",
     ),
+    pytest.param(
+        ResponsesTestCase(
+            input="What is the latest version of Python?",
+            tools=[{"type": "web_search_2025_08_26"}],
+            expected="python",
+        ),
+        id="web_search_2025_08_26_type",
+    ),
 ]
 
 # File search test cases