diff --git a/codex-rs/app-server/src/request_processors/thread_processor_tests.rs b/codex-rs/app-server/src/request_processors/thread_processor_tests.rs
index bf24ad4a68e1..461e1793bb80 100644
--- a/codex-rs/app-server/src/request_processors/thread_processor_tests.rs
+++ b/codex-rs/app-server/src/request_processors/thread_processor_tests.rs
@@ -689,6 +689,7 @@ mod thread_processor_behavior_tests {
             websocket_connect_timeout_ms: None,
             requires_openai_auth: false,
             supports_websockets: true,
+            supports_standalone_web_search: false,
         };
         let config_manager = ConfigManager::new(
             temp_dir.path().to_path_buf(),
diff --git a/codex-rs/app-server/tests/suite/v2/web_search.rs b/codex-rs/app-server/tests/suite/v2/web_search.rs
index 41450cec7f19..e282c4d78195 100644
--- a/codex-rs/app-server/tests/suite/v2/web_search.rs
+++ b/codex-rs/app-server/tests/suite/v2/web_search.rs
@@ -43,6 +43,23 @@ const DEFAULT_READ_TIMEOUT: Duration = Duration::from_secs(10);
 
 #[tokio::test]
 async fn standalone_web_search_round_trips_output() -> Result<()> {
+    assert_standalone_web_search_round_trips_output(WebSearchProvider::ChatGpt).await
+}
+
+#[tokio::test]
+async fn standalone_web_search_round_trips_output_for_custom_provider() -> Result<()> {
+    assert_standalone_web_search_round_trips_output(WebSearchProvider::CustomResponses).await
+}
+
+#[derive(Clone, Copy)]
+enum WebSearchProvider {
+    ChatGpt,
+    CustomResponses,
+}
+
+async fn assert_standalone_web_search_round_trips_output(
+    provider: WebSearchProvider,
+) -> Result<()> {
     let call_id = "web-run-1";
     let expected_model_id = "model-id-from-search-context";
     let search_context = json!({
@@ -57,7 +74,11 @@ async fn standalone_web_search_round_trips_output() -> Result<()> {
         json!({ "openai/search_context": search_context }).to_string(),
     )]);
     let server = responses::start_mock_server().await;
-    mount_search_response(&server).await;
+    let search_path = match provider {
+        WebSearchProvider::ChatGpt => "/api/codex/alpha/search",
+        WebSearchProvider::CustomResponses => "/v1/alpha/search",
+    };
+    mount_search_response(&server, search_path).await;
 
     let response_mock = responses::mount_sse_sequence(
         &server,
@@ -84,24 +105,47 @@ async fn standalone_web_search_round_trips_output() -> Result<()> {
     .await;
 
     let codex_home = TempDir::new()?;
-    MockResponsesConfig::new(&server.uri())
-        .with_model_provider("openai-custom")
-        .with_provider_name("OpenAI")
-        .with_provider_base_url(&format!("{}/api/codex", server.uri()))
+    let config = MockResponsesConfig::new(&server.uri())
         .with_root_config(&format!("chatgpt_base_url = \"{}\"", server.uri()))
         .enable_feature(Feature::StandaloneWebSearch)
-        .with_provider_config("supports_websockets = false")
-        .with_provider_config("requires_openai_auth = true")
-        .write(codex_home.path())?;
-    write_chatgpt_auth(
-        codex_home.path(),
-        ChatGptAuthFixture::new("access-chatgpt"),
-        AuthCredentialsStoreMode::File,
-    )?;
+        .with_provider_config("supports_websockets = false");
+    let config = match provider {
+        WebSearchProvider::ChatGpt => config
+            .with_model_provider("openai-custom")
+            .with_provider_name("OpenAI")
+            .with_provider_base_url(&format!("{}/api/codex", server.uri()))
+            .with_provider_config("requires_openai_auth = true"),
+        WebSearchProvider::CustomResponses => config
+            .with_model_provider("custom-responses")
+            .with_provider_name("Custom Responses")
+            .with_provider_base_url(&format!("{}/v1", server.uri()))
+            .with_provider_config("env_key = \"CUSTOM_RESPONSES_API_KEY\"")
+            .with_provider_config("supports_standalone_web_search = true")
+            .with_provider_config("requires_openai_auth = false"),
+    };
+    config.write(codex_home.path())?;
+
+    if matches!(provider, WebSearchProvider::ChatGpt) {
+        write_chatgpt_auth(
+            codex_home.path(),
+            ChatGptAuthFixture::new("access-chatgpt"),
+            AuthCredentialsStoreMode::File,
+        )?;
+    }
+
+    let env_overrides = match provider {
+        WebSearchProvider::ChatGpt => {
+            vec![("OPENAI_API_KEY", None), ("CUSTOM_RESPONSES_API_KEY", None)]
+        }
+        WebSearchProvider::CustomResponses => vec![
+            ("OPENAI_API_KEY", None),
+            ("CUSTOM_RESPONSES_API_KEY", Some("test-api-key")),
+        ],
+    };
 
     let mut mcp = TestAppServer::builder()
         .with_codex_home(codex_home.path())
-        .with_env_overrides(&[("OPENAI_API_KEY", None)])
+        .with_env_overrides(&env_overrides)
         .build_initialized_with_timeout(DEFAULT_READ_TIMEOUT)
         .await?;
 
@@ -159,7 +203,28 @@ async fn standalone_web_search_round_trips_output() -> Result<()> {
         "standalone web search should replace hosted web search"
     );
 
-    let search_request = search_request(&server).await?;
+    let search_request = search_request(&server, search_path).await?;
+    let expected_authorization = match provider {
+        WebSearchProvider::ChatGpt => "Bearer access-chatgpt",
+        WebSearchProvider::CustomResponses => "Bearer test-api-key",
+    };
+    assert_eq!(
+        search_request
+            .headers
+            .get("authorization")
+            .context("standalone search should include provider authorization")?
+            .to_str()
+            .context("standalone search authorization should be valid ASCII")?,
+        expected_authorization
+    );
+    if matches!(provider, WebSearchProvider::CustomResponses) {
+        assert!(
+            search_request
+                .headers
+                .get("x-openai-actor-authorization")
+                .is_none()
+        );
+    }
     assert_eq!(
         search_request
             .headers
@@ -268,7 +333,7 @@ async fn standalone_web_search_round_trips_output() -> Result<()> {
     drop(mcp);
     let mut reloaded_mcp = TestAppServer::builder()
         .with_codex_home(codex_home.path())
-        .with_env_overrides(&[("OPENAI_API_KEY", None)])
+        .with_env_overrides(&env_overrides)
         .build_initialized_with_timeout(DEFAULT_READ_TIMEOUT)
         .await?;
     let read_req = reloaded_mcp
@@ -310,9 +375,9 @@ async fn wait_for_web_search_completed(
     }
 }
 
-async fn mount_search_response(server: &MockServer) {
+async fn mount_search_response(server: &MockServer, search_path: &str) {
     Mock::given(method("POST"))
-        .and(path("/api/codex/alpha/search"))
+        .and(path(search_path))
         .respond_with(ResponseTemplate::new(200).set_body_json(json!({
             "encrypted_output": "ciphertext",
             "output": "Search result",
@@ -340,13 +405,13 @@ fn has_hosted_web_search(body: &Value) -> bool {
         })
 }
 
-async fn search_request(server: &MockServer) -> Result<wiremock::Request> {
+async fn search_request(server: &MockServer, search_path: &str) -> Result<wiremock::Request> {
     let requests = server
         .received_requests()
         .await
         .context("failed to fetch received requests")?;
     requests
         .into_iter()
-        .find(|request| request.url.path() == "/api/codex/alpha/search")
+        .find(|request| request.url.path() == search_path)
         .context("expected standalone search request")
 }
diff --git a/codex-rs/config/src/thread_config.rs b/codex-rs/config/src/thread_config.rs
index 14360c277089..76d76fd59f0e 100644
--- a/codex-rs/config/src/thread_config.rs
+++ b/codex-rs/config/src/thread_config.rs
@@ -284,6 +284,7 @@ mod tests {
                     wire_api = "responses"
                     requires_openai_auth = false
                     supports_websockets = true
+                    supports_standalone_web_search = true
 
                     [features]
                     plugins = false
@@ -312,6 +313,7 @@ mod tests {
             websocket_connect_timeout_ms: None,
             requires_openai_auth: false,
             supports_websockets: true,
+            supports_standalone_web_search: true,
         }
     }
 }
diff --git a/codex-rs/config/src/thread_config/proto/codex.thread_config.v1.proto b/codex-rs/config/src/thread_config/proto/codex.thread_config.v1.proto
index 1efccfd1bfb5..5bcff769864f 100644
--- a/codex-rs/config/src/thread_config/proto/codex.thread_config.v1.proto
+++ b/codex-rs/config/src/thread_config/proto/codex.thread_config.v1.proto
@@ -48,6 +48,7 @@ message ModelProvider {
   optional uint64 websocket_connect_timeout_ms = 15;
   bool requires_openai_auth = 16;
   bool supports_websockets = 17;
+  bool supports_standalone_web_search = 18;
 }
 
 message StringMap {
diff --git a/codex-rs/config/src/thread_config/proto/codex.thread_config.v1.rs b/codex-rs/config/src/thread_config/proto/codex.thread_config.v1.rs
index 30a76bc6b2f4..05b1cf0eca2b 100644
--- a/codex-rs/config/src/thread_config/proto/codex.thread_config.v1.rs
+++ b/codex-rs/config/src/thread_config/proto/codex.thread_config.v1.rs
@@ -75,6 +75,8 @@ pub struct ModelProvider {
     pub requires_openai_auth: bool,
     #[prost(bool, tag = "17")]
     pub supports_websockets: bool,
+    #[prost(bool, tag = "18")]
+    pub supports_standalone_web_search: bool,
 }
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct StringMap {
diff --git a/codex-rs/config/src/thread_config/remote.rs b/codex-rs/config/src/thread_config/remote.rs
index 7a8e4ce88fa6..2a52c3b65715 100644
--- a/codex-rs/config/src/thread_config/remote.rs
+++ b/codex-rs/config/src/thread_config/remote.rs
@@ -190,6 +190,7 @@ fn model_provider_from_proto(
         websocket_connect_timeout_ms: provider.websocket_connect_timeout_ms,
         requires_openai_auth: provider.requires_openai_auth,
         supports_websockets: provider.supports_websockets,
+        supports_standalone_web_search: provider.supports_standalone_web_search,
     };
     Ok((id, info))
 }
@@ -217,6 +218,7 @@ fn model_provider_to_proto(
         websocket_connect_timeout_ms,
         requires_openai_auth,
         supports_websockets,
+        supports_standalone_web_search,
     } = provider;
 
     proto::ModelProvider {
@@ -237,6 +239,7 @@ fn model_provider_to_proto(
         websocket_connect_timeout_ms,
         requires_openai_auth,
         supports_websockets,
+        supports_standalone_web_search,
     }
 }
 
@@ -421,6 +424,21 @@ mod tests {
     fn model_provider_proto_roundtrips_through_domain_type() {
         let expected = expected_provider();
         let proto = model_provider_to_proto("local", expected.clone());
+        assert!(proto.supports_standalone_web_search);
+        let (id, actual) = model_provider_from_proto(proto).expect("model provider from proto");
+
+        assert_eq!(id, "local");
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn model_provider_proto_defaults_standalone_web_search_to_false() {
+        let expected = ModelProviderInfo {
+            supports_standalone_web_search: false,
+            ..expected_provider()
+        };
+        let proto = model_provider_to_proto("local", expected.clone());
+        assert!(!proto.supports_standalone_web_search);
         let (id, actual) = model_provider_from_proto(proto).expect("model provider from proto");
 
         assert_eq!(id, "local");
@@ -473,6 +491,7 @@ mod tests {
                             websocket_connect_timeout_ms: Some(10_000),
                             requires_openai_auth: false,
                             supports_websockets: true,
+                            supports_standalone_web_search: true,
                         }],
                         features: HashMap::from([
                             ("plugins".to_string(), false),
@@ -536,6 +555,7 @@ mod tests {
             websocket_connect_timeout_ms: Some(10_000),
             requires_openai_auth: false,
             supports_websockets: true,
+            supports_standalone_web_search: true,
             aws: None,
         }
     }
diff --git a/codex-rs/core/config.schema.json b/codex-rs/core/config.schema.json
index e6ec8d92c227..62b6556ca1d0 100644
--- a/codex-rs/core/config.schema.json
+++ b/codex-rs/core/config.schema.json
@@ -1736,6 +1736,11 @@
           "minimum": 0.0,
           "type": "integer"
         },
+        "supports_standalone_web_search": {
+          "default": false,
+          "description": "Whether this provider supports the standalone web-search endpoint.",
+          "type": "boolean"
+        },
         "supports_websockets": {
           "default": false,
           "description": "Whether this provider supports the Responses API WebSocket transport.",
diff --git a/codex-rs/core/src/compact_tests.rs b/codex-rs/core/src/compact_tests.rs
index f34d71f96b86..f3f50e021ec1 100644
--- a/codex-rs/core/src/compact_tests.rs
+++ b/codex-rs/core/src/compact_tests.rs
@@ -284,6 +284,7 @@ fn should_use_remote_compact_task_for_azure_provider() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     assert!(should_use_remote_compact_task(&provider));
diff --git a/codex-rs/core/src/tools/spec_plan.rs b/codex-rs/core/src/tools/spec_plan.rs
index e6b69ab2deba..e7bbeaaace7b 100644
--- a/codex-rs/core/src/tools/spec_plan.rs
+++ b/codex-rs/core/src/tools/spec_plan.rs
@@ -619,6 +619,7 @@ fn add_tool_sources(context: &CoreToolPlanContext<'_>, planned_tools: &mut Plann
 
 fn standalone_web_search_enabled(turn_context: &TurnContext) -> bool {
     namespace_tools_enabled(turn_context)
+        && turn_context.provider.capabilities().web_search
         && (turn_context.model_info.use_responses_lite
             || turn_context
                 .config
diff --git a/codex-rs/core/tests/responses_headers.rs b/codex-rs/core/tests/responses_headers.rs
index b94f7ed49df4..7343e6703851 100644
--- a/codex-rs/core/tests/responses_headers.rs
+++ b/codex-rs/core/tests/responses_headers.rs
@@ -88,6 +88,7 @@ async fn responses_stream_includes_subagent_header_on_review() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     let codex_home = TempDir::new().expect("failed to create TempDir");
@@ -223,6 +224,7 @@ async fn responses_stream_includes_subagent_header_on_other() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     let codex_home = TempDir::new().expect("failed to create TempDir");
@@ -339,6 +341,7 @@ async fn responses_respects_model_info_overrides_from_config() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     let codex_home = TempDir::new().expect("failed to create TempDir");
diff --git a/codex-rs/core/tests/suite/client.rs b/codex-rs/core/tests/suite/client.rs
index bc0d7a9f79cb..0127de4a9fef 100644
--- a/codex-rs/core/tests/suite/client.rs
+++ b/codex-rs/core/tests/suite/client.rs
@@ -1450,6 +1450,7 @@ async fn send_provider_auth_request(server: &MockServer, auth: ModelProviderAuth
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     send_request_with_provider(provider).await;
@@ -3186,6 +3187,7 @@ async fn azure_responses_request_includes_store_and_prefixed_item_ids() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     let codex_home = TempDir::new().unwrap();
@@ -3843,6 +3845,7 @@ async fn azure_overrides_assign_properties_used_for_responses_url() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     // Init session
@@ -3932,6 +3935,7 @@ async fn env_var_overrides_loaded_auth() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     // Init session
diff --git a/codex-rs/core/tests/suite/client_websockets.rs b/codex-rs/core/tests/suite/client_websockets.rs
index a218e721d716..988419dec8f1 100755
--- a/codex-rs/core/tests/suite/client_websockets.rs
+++ b/codex-rs/core/tests/suite/client_websockets.rs
@@ -2285,6 +2285,7 @@ fn websocket_provider_with_connect_timeout(
         websocket_connect_timeout_ms,
         requires_openai_auth: false,
         supports_websockets: true,
+        supports_standalone_web_search: false,
     }
 }
 
diff --git a/codex-rs/core/tests/suite/responses_lite.rs b/codex-rs/core/tests/suite/responses_lite.rs
index 83cc6208be73..40de16c31ede 100644
--- a/codex-rs/core/tests/suite/responses_lite.rs
+++ b/codex-rs/core/tests/suite/responses_lite.rs
@@ -9,6 +9,7 @@ use codex_extension_api::ExtensionRegistryBuilder;
 use codex_features::Feature;
 use codex_image_generation_extension::install as install_image_generation_extension;
 use codex_login::CodexAuth;
+use codex_login::auth::BedrockApiKeyAuth;
 use codex_protocol::config_types::WebSearchMode;
 use codex_protocol::models::ImageDetail;
 use codex_protocol::openai_models::InputModality;
@@ -290,6 +291,140 @@ async fn responses_lite_exposes_standalone_tools_for_actor_authorized_provider()
     Ok(())
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn responses_lite_exposes_standalone_web_search_for_opted_in_custom_provider() -> Result<()> {
+    assert_responses_lite_custom_provider_web_search(
+        WebSearchMode::Live,
+        /*supports_standalone_web_search*/ true,
+        /*expect_web_run*/ true,
+    )
+    .await
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn responses_lite_does_not_expose_standalone_web_search_for_custom_provider_by_default()
+-> Result<()> {
+    assert_responses_lite_custom_provider_web_search(
+        WebSearchMode::Live,
+        /*supports_standalone_web_search*/ false,
+        /*expect_web_run*/ false,
+    )
+    .await
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn responses_lite_does_not_expose_disabled_standalone_web_search_for_opted_in_provider()
+-> Result<()> {
+    assert_responses_lite_custom_provider_web_search(
+        WebSearchMode::Disabled,
+        /*supports_standalone_web_search*/ true,
+        /*expect_web_run*/ false,
+    )
+    .await
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn responses_lite_does_not_expose_standalone_web_search_for_opted_in_bedrock_provider()
+-> Result<()> {
+    skip_if_no_network!(Ok(()));
+
+    let server = responses::start_mock_server().await;
+    let response_mock = responses::mount_sse_once(
+        &server,
+        responses::sse(vec![
+            responses::ev_response_created("resp-1"),
+            responses::ev_completed("resp-1"),
+        ]),
+    )
+    .await;
+
+    let auth = CodexAuth::BedrockApiKey(BedrockApiKeyAuth {
+        api_key: "dummy".to_string(),
+        region: "us-east-1".to_string(),
+    });
+    let extensions = responses_extensions(&auth);
+    let mut builder = test_codex()
+        .with_auth(auth)
+        .with_extensions(extensions)
+        .with_model_info_override("gpt-5.4", |model_info| {
+            model_info.use_responses_lite = true;
+        })
+        .with_config(|config| {
+            configure_responses_tools(config);
+            config.model_provider.name = "Amazon Bedrock".to_string();
+            config.model_provider.requires_openai_auth = false;
+            config.model_provider.http_headers = None;
+            config.model_provider.supports_standalone_web_search = true;
+        });
+    let test = builder.build(&server).await?;
+
+    test.submit_turn("Use standalone web search").await?;
+
+    let request = response_mock.single_request();
+    assert_eq!(
+        request.header(RESPONSES_LITE_HEADER).as_deref(),
+        Some("true")
+    );
+    let body = request.body_json();
+    assert!(body.get("tools").is_none());
+    let tools = additional_tools(&body)?;
+    assert!(!has_namespaced_tool(tools, "web", "run"));
+    assert!(!has_hosted_tool(tools, "web_search"));
+
+    Ok(())
+}
+
+async fn assert_responses_lite_custom_provider_web_search(
+    web_search_mode: WebSearchMode,
+    supports_standalone_web_search: bool,
+    expect_web_run: bool,
+) -> Result<()> {
+    skip_if_no_network!(Ok(()));
+
+    let server = responses::start_mock_server().await;
+    let response_mock = responses::mount_sse_once(
+        &server,
+        responses::sse(vec![
+            responses::ev_response_created("resp-1"),
+            responses::ev_completed("resp-1"),
+        ]),
+    )
+    .await;
+
+    let auth = CodexAuth::from_api_key("dummy");
+    let extensions = responses_extensions(&auth);
+    let mut builder = test_codex()
+        .with_auth(auth)
+        .with_extensions(extensions)
+        .with_model_info_override("gpt-5.4", |model_info| {
+            model_info.use_responses_lite = true;
+        })
+        .with_config(move |config| {
+            configure_responses_tools(config);
+            assert!(config.web_search_mode.set(web_search_mode).is_ok());
+            config.model_provider.name = "custom-responses".to_string();
+            config.model_provider.requires_openai_auth = false;
+            config.model_provider.http_headers = None;
+            config.model_provider.supports_standalone_web_search = supports_standalone_web_search;
+        });
+    let test = builder.build(&server).await?;
+
+    test.submit_turn("Use standalone web search").await?;
+
+    let request = response_mock.single_request();
+    assert_eq!(
+        request.header(RESPONSES_LITE_HEADER).as_deref(),
+        Some("true")
+    );
+    let body = request.body_json();
+    assert!(body.get("tools").is_none());
+    let tools = additional_tools(&body)?;
+    assert_eq!(has_namespaced_tool(tools, "web", "run"), expect_web_run);
+    assert!(!has_hosted_tool(tools, "web_search"));
+
+    Ok(())
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn responses_lite_compact_request_uses_lite_transport_contract() -> Result<()> {
     skip_if_no_network!(Ok(()));
diff --git a/codex-rs/core/tests/suite/stream_error_allows_next_turn.rs b/codex-rs/core/tests/suite/stream_error_allows_next_turn.rs
index 2c86edc53c77..f93a4b66e68f 100644
--- a/codex-rs/core/tests/suite/stream_error_allows_next_turn.rs
+++ b/codex-rs/core/tests/suite/stream_error_allows_next_turn.rs
@@ -81,6 +81,7 @@ async fn continue_after_stream_error() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     let TestCodex { codex, .. } = test_codex()
diff --git a/codex-rs/core/tests/suite/stream_no_completed.rs b/codex-rs/core/tests/suite/stream_no_completed.rs
index 6e028279b1b6..207a2754cf9d 100644
--- a/codex-rs/core/tests/suite/stream_no_completed.rs
+++ b/codex-rs/core/tests/suite/stream_no_completed.rs
@@ -64,6 +64,7 @@ async fn retries_on_early_close() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     let TestCodex { codex, .. } = test_codex()
diff --git a/codex-rs/ext/web-search/src/extension.rs b/codex-rs/ext/web-search/src/extension.rs
index d59a34649dd0..e269a18a3f24 100644
--- a/codex-rs/ext/web-search/src/extension.rs
+++ b/codex-rs/ext/web-search/src/extension.rs
@@ -43,7 +43,8 @@ impl From<&Config> for WebSearchExtensionConfig {
         Self {
             // Core selects this executor per turn using the feature flag or model metadata.
             available: (config.model_provider.is_openai()
-                || config.model_provider.uses_openai_actor_authorization())
+                || config.model_provider.uses_openai_actor_authorization()
+                || config.model_provider.supports_standalone_web_search)
                 && web_search_mode != WebSearchMode::Disabled,
             provider: config.model_provider.clone(),
             settings: search_settings(config, web_search_mode),
diff --git a/codex-rs/login/src/auth_env_telemetry.rs b/codex-rs/login/src/auth_env_telemetry.rs
index 3cec5a4ce3e9..86cbbfd8fea0 100644
--- a/codex-rs/login/src/auth_env_telemetry.rs
+++ b/codex-rs/login/src/auth_env_telemetry.rs
@@ -76,6 +76,7 @@ mod tests {
             websocket_connect_timeout_ms: None,
             requires_openai_auth: false,
             supports_websockets: false,
+            supports_standalone_web_search: false,
         };
 
         let telemetry =
diff --git a/codex-rs/model-provider-info/src/lib.rs b/codex-rs/model-provider-info/src/lib.rs
index 803d858789c9..82fc5fc2a6bd 100644
--- a/codex-rs/model-provider-info/src/lib.rs
+++ b/codex-rs/model-provider-info/src/lib.rs
@@ -138,6 +138,9 @@ pub struct ModelProviderInfo {
     /// Whether this provider supports the Responses API WebSocket transport.
     #[serde(default)]
     pub supports_websockets: bool,
+    /// Whether this provider supports the standalone web-search endpoint.
+    #[serde(default)]
+    pub supports_standalone_web_search: bool,
 }
 
 /// AWS SigV4 auth configuration for a model provider.
@@ -360,6 +363,7 @@ impl ModelProviderInfo {
             websocket_connect_timeout_ms: None,
             requires_openai_auth: true,
             supports_websockets: true,
+            supports_standalone_web_search: true,
         }
     }
 
@@ -393,6 +397,7 @@ impl ModelProviderInfo {
             websocket_connect_timeout_ms: None,
             requires_openai_auth: false,
             supports_websockets: false,
+            supports_standalone_web_search: false,
         }
     }
 
@@ -540,6 +545,7 @@ pub fn create_oss_provider_with_base_url(base_url: &str, wire_api: WireApi) -> M
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     }
 }
 
diff --git a/codex-rs/model-provider-info/src/model_provider_info_tests.rs b/codex-rs/model-provider-info/src/model_provider_info_tests.rs
index cc7f6851f298..354c7fc2b80b 100644
--- a/codex-rs/model-provider-info/src/model_provider_info_tests.rs
+++ b/codex-rs/model-provider-info/src/model_provider_info_tests.rs
@@ -29,6 +29,7 @@ base_url = "http://localhost:11434/v1"
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     let provider: ModelProviderInfo = toml::from_str(azure_provider_toml).unwrap();
@@ -63,6 +64,7 @@ query_params = { api-version = "2025-04-01-preview" }
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     let provider: ModelProviderInfo = toml::from_str(azure_provider_toml).unwrap();
@@ -77,6 +79,7 @@ base_url = "https://example.com"
 env_key = "API_KEY"
 http_headers = { "X-Example-Header" = "example-value" }
 env_http_headers = { "X-Example-Env-Header" = "EXAMPLE_ENV_VAR" }
+supports_standalone_web_search = true
         "#;
     let expected_provider = ModelProviderInfo {
         name: "Example".into(),
@@ -100,6 +103,7 @@ env_http_headers = { "X-Example-Env-Header" = "EXAMPLE_ENV_VAR" }
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: true,
     };
 
     let provider: ModelProviderInfo = toml::from_str(azure_provider_toml).unwrap();
@@ -177,6 +181,7 @@ fn test_supports_remote_compaction_for_azure_name() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     assert!(provider.supports_remote_compaction());
@@ -202,6 +207,7 @@ fn test_supports_remote_compaction_for_non_openai_non_azure_provider() {
         websocket_connect_timeout_ms: None,
         requires_openai_auth: false,
         supports_websockets: false,
+        supports_standalone_web_search: false,
     };
 
     assert!(!provider.supports_remote_compaction());
@@ -310,6 +316,7 @@ fn test_create_amazon_bedrock_provider() {
             websocket_connect_timeout_ms: None,
             requires_openai_auth: false,
             supports_websockets: false,
+            supports_standalone_web_search: false,
         }
     );
 }
diff --git a/codex-rs/model-provider/src/provider.rs b/codex-rs/model-provider/src/provider.rs
index 756bd641375c..57f950a09eb4 100644
--- a/codex-rs/model-provider/src/provider.rs
+++ b/codex-rs/model-provider/src/provider.rs
@@ -441,6 +441,7 @@ mod tests {
             websocket_connect_timeout_ms: None,
             requires_openai_auth: false,
             supports_websockets: false,
+            supports_standalone_web_search: false,
         }
     }