diff --git a/apps/server/src/provider/CodexManagedRuntime.test.ts b/apps/server/src/provider/CodexManagedRuntime.test.ts
index 2c697f8fa8531..2c38ff95dee0a 100644
--- a/apps/server/src/provider/CodexManagedRuntime.test.ts
+++ b/apps/server/src/provider/CodexManagedRuntime.test.ts
@@ -145,7 +145,7 @@ it.live.each(
             arg.startsWith("model_providers.openai_token_sharing="),
           )!;
           assert.include(provider, 'base_url="https://api.openai.com/v1"');
-          assert.include(provider, 'model_catalog_url="https://api.openai.com/v1/models"');
+          assert.notInclude(provider, "model_catalog_url");
           assert.notInclude(provider, "env_key");
           assert.include(provider, "refresh_interval_ms=0");
           // regression: #16132 Codex fetches each token through this helper, so a running
diff --git a/apps/server/src/provider/CodexManagedRuntime.ts b/apps/server/src/provider/CodexManagedRuntime.ts
index 3704c919c2791..d72a089c74fa4 100644
--- a/apps/server/src/provider/CodexManagedRuntime.ts
+++ b/apps/server/src/provider/CodexManagedRuntime.ts
@@ -23,7 +23,8 @@ const managedCodexLaunchArgs = (command: string, args: ReadonlyArray<string>) =>
   [
     'model_provider="openai_token_sharing"',
     // Codex persists this provider ID in rollouts and needs it unchanged to resume.
-    `model_providers.openai_token_sharing={name="OpenAI Token Sharing",base_url="https://api.openai.com/v1",model_catalog_url="https://api.openai.com/v1/models",wire_api="responses",requires_openai_auth=false,supports_websockets=false,auth={command=${JSON.stringify(command)},args=${JSON.stringify(args)},timeout_ms=${COMMAND_TIMEOUT_MS},refresh_interval_ms=0}}`,
+    // An explicit catalog URL disables bundled metadata fallback when discovery fails.
+    `model_providers.openai_token_sharing={name="OpenAI Token Sharing",base_url="https://api.openai.com/v1",wire_api="responses",requires_openai_auth=false,supports_websockets=false,auth={command=${JSON.stringify(command)},args=${JSON.stringify(args)},timeout_ms=${COMMAND_TIMEOUT_MS},refresh_interval_ms=0}}`,
     "features.api_key_model_discovery=true",
     "features.multi_agent=false",
     "features.multi_agent_v2=false",