diff --git a/extensions/openai/provider-auth.contract.test.ts b/extensions/openai/provider-auth.contract.test.ts
index 382748e368e2..8d68f02702dd 100644
--- a/extensions/openai/provider-auth.contract.test.ts
+++ b/extensions/openai/provider-auth.contract.test.ts
@@ -1,6 +1,7 @@
 // Openai tests cover provider auth.contract plugin behavior.
 import { describeOpenAICodexProviderAuthContract } from "openclaw/plugin-sdk/provider-test-contracts";
 import { vi } from "vitest";
+import { OPENAI_CODEX_DEFAULT_MODEL } from "./default-models.js";
 
 const loginOpenAICodexOAuthMock = vi.hoisted(() => vi.fn());
 
@@ -9,5 +10,6 @@ vi.mock("./openai-chatgpt-oauth.runtime.js", () => ({
 }));
 
 describeOpenAICodexProviderAuthContract(() => import("./index.js"), {
+  expectedCodexDefaultModel: OPENAI_CODEX_DEFAULT_MODEL,
   loginOpenAICodexOAuthMock,
 });
diff --git a/src/plugin-sdk/test-helpers/provider-auth-contract.ts b/src/plugin-sdk/test-helpers/provider-auth-contract.ts
index 413a37e71356..2a1b4e6d525b 100644
--- a/src/plugin-sdk/test-helpers/provider-auth-contract.ts
+++ b/src/plugin-sdk/test-helpers/provider-auth-contract.ts
@@ -29,6 +29,7 @@ export type ProviderAuthContractPluginLoader = () => Promise<{
 }>;
 
 export type OpenAICodexProviderAuthContractOptions = {
+  expectedCodexDefaultModel: string;
   loginOpenAICodexOAuthMock: ReturnType<typeof vi.fn<LoginOpenAICodexOAuth>>;
 };
 
@@ -80,6 +81,7 @@ function buildOpenAICodexOAuthResult(params: {
   refresh: string;
   expires: number;
   email?: string;
+  defaultModel: string;
 }) {
   return {
     profiles: [
@@ -99,12 +101,12 @@ function buildOpenAICodexOAuthResult(params: {
       agents: {
         defaults: {
           models: {
-            "openai/gpt-5.5": {},
+            [params.defaultModel]: {},
           },
         },
       },
     },
-    defaultModel: "openai/gpt-5.5",
+    defaultModel: params.defaultModel,
     notes: undefined,
   };
 }
@@ -146,7 +148,7 @@ export function describeOpenAICodexProviderAuthContract(
   const state = {
     authStore: { version: 1, profiles: {} } as AuthProfileStore,
   };
-  const { loginOpenAICodexOAuthMock } = options;
+  const { expectedCodexDefaultModel, loginOpenAICodexOAuthMock } = options;
 
   describe("openai provider ChatGPT auth contract", () => {
     installSharedAuthProfileStoreHooks(state);
@@ -166,6 +168,7 @@ export function describeOpenAICodexProviderAuthContract(
           access: params.access,
           refresh: "refresh-token",
           expires: 1_700_000_000_000,
+          defaultModel: expectedCodexDefaultModel,
         }),
       );
     }
@@ -193,6 +196,7 @@ export function describeOpenAICodexProviderAuthContract(
           refresh: "refresh-token",
           expires: 1_700_000_000_000,
           email: "user@example.com",
+          defaultModel: expectedCodexDefaultModel,
         }),
       );
     });
@@ -219,6 +223,7 @@ export function describeOpenAICodexProviderAuthContract(
           refresh: "refresh-token",
           expires: 1_700_000_000_000,
           email: "jwt-user@example.com",
+          defaultModel: expectedCodexDefaultModel,
         }),
       );
     });
@@ -277,6 +282,7 @@ export function describeOpenAICodexProviderAuthContract(
           access: "not-a-jwt-token",
           refresh: "refresh-token",
           expires: 1_700_000_000_000,
+          defaultModel: expectedCodexDefaultModel,
         }),
       );
     });