diff --git a/extensions/openai/openai-codex-provider.ts b/extensions/openai/openai-codex-provider.ts
index 21464291ec5..9b618a6dbc8 100644
--- a/extensions/openai/openai-codex-provider.ts
+++ b/extensions/openai/openai-codex-provider.ts
@@ -27,6 +27,7 @@ import {
   cloneFirstTemplateModel,
   findCatalogTemplate,
   isOpenAIApiBaseUrl,
+  isOpenAICodexBaseUrl,
   matchesExactOrPrefix,
 } from "./shared.js";
 import {
@@ -83,14 +84,6 @@ const OPENAI_CODEX_MODERN_MODEL_IDS = [
 ] as const;
 const OPENAI_RESPONSES_STREAM_HOOKS = buildProviderStreamFamilyHooks("openai-responses-defaults");
 
-function isOpenAICodexBaseUrl(baseUrl?: string): boolean {
-  const trimmed = baseUrl?.trim();
-  if (!trimmed) {
-    return false;
-  }
-  return /^https?:\/\/chatgpt\.com\/backend-api\/?$/i.test(trimmed);
-}
-
 function normalizeCodexTransport(model: ProviderRuntimeModel): ProviderRuntimeModel {
   const useCodexTransport =
     !model.baseUrl || isOpenAIApiBaseUrl(model.baseUrl) || isOpenAICodexBaseUrl(model.baseUrl);
diff --git a/extensions/openai/shared.ts b/extensions/openai/shared.ts
index f31371a2e22..a01ac442252 100644
--- a/extensions/openai/shared.ts
+++ b/extensions/openai/shared.ts
@@ -23,4 +23,12 @@ export function isOpenAIApiBaseUrl(baseUrl?: string): boolean {
   return /^https?:\/\/api\.openai\.com(?:\/v1)?\/?$/i.test(trimmed);
 }
 
+export function isOpenAICodexBaseUrl(baseUrl?: string): boolean {
+  const trimmed = baseUrl?.trim();
+  if (!trimmed) {
+    return false;
+  }
+  return /^https?:\/\/chatgpt\.com\/backend-api\/?$/i.test(trimmed);
+}
+
 export { cloneFirstTemplateModel, findCatalogTemplate, matchesExactOrPrefix };
diff --git a/extensions/openai/transport-policy.test.ts b/extensions/openai/transport-policy.test.ts
index 71eaf312359..65c05c9b371 100644
--- a/extensions/openai/transport-policy.test.ts
+++ b/extensions/openai/transport-policy.test.ts
@@ -104,4 +104,26 @@ describe("openai transport policy", () => {
       degradeCooldownMs: 60_000,
     });
   });
+
+  it("treats ChatGPT Codex backend routes as native OpenAI-family transports", () => {
+    expect(
+      resolveOpenAIWebSocketSessionPolicy({
+        provider: "openai-codex",
+        modelId: "gpt-5.4",
+        model: {
+          ...nativeModel,
+          provider: "openai-codex",
+          api: "openai-codex-responses",
+          baseUrl: "https://chatgpt.com/backend-api",
+        },
+        sessionId: "session-123",
+      }),
+    ).toMatchObject({
+      headers: {
+        "x-client-request-id": "session-123",
+        "x-openclaw-session-id": "session-123",
+      },
+      degradeCooldownMs: 60_000,
+    });
+  });
 });
diff --git a/extensions/openai/transport-policy.ts b/extensions/openai/transport-policy.ts
index a87aaf9daa3..60be75e9ded 100644
--- a/extensions/openai/transport-policy.ts
+++ b/extensions/openai/transport-policy.ts
@@ -5,20 +5,12 @@ import type {
   ProviderWebSocketSessionPolicy,
 } from "openclaw/plugin-sdk/plugin-entry";
 import { normalizeProviderId } from "openclaw/plugin-sdk/provider-model-shared";
-import { isOpenAIApiBaseUrl } from "./shared.js";
+import { isOpenAIApiBaseUrl, isOpenAICodexBaseUrl } from "./shared.js";
 
 const DEFAULT_OPENAI_WS_DEGRADE_COOLDOWN_MS = 60_000;
 const AZURE_PROVIDER_IDS = new Set(["azure-openai", "azure-openai-responses"]);
 const OPENAI_CODEX_PROVIDER_ID = "openai-codex";
 
-function isOpenAICodexBaseUrl(baseUrl?: string): boolean {
-  const trimmed = baseUrl?.trim();
-  if (!trimmed) {
-    return false;
-  }
-  return /^https?:\/\/chatgpt\.com\/backend-api\/?$/i.test(trimmed);
-}
-
 function isAzureOpenAIBaseUrl(baseUrl?: string): boolean {
   const trimmed = baseUrl?.trim();
   if (!trimmed) {