diff --git a/src/utils/glmt-deprecation.ts b/src/utils/glmt-deprecation.ts
index 8235aea8..38a3599f 100644
--- a/src/utils/glmt-deprecation.ts
+++ b/src/utils/glmt-deprecation.ts
@@ -25,11 +25,7 @@ export function isLegacyGlmtBaseUrl(baseUrl: string | null | undefined): boolean
     return false;
   }
 
-  return (
-    normalized === LEGACY_GLMT_BASE_URL ||
-    normalized.includes('/api/coding/paas/v4') ||
-    normalized.endsWith('/chat/completions')
-  );
+  return normalized === LEGACY_GLMT_BASE_URL || normalized.includes('/api/coding/paas/v4');
 }
 
 export function normalizeDeprecatedGlmtEnv(env: Record<string, string>): GlmtNormalizationResult {
diff --git a/tests/unit/utils/glmt-deprecation.test.ts b/tests/unit/utils/glmt-deprecation.test.ts
index d003a9e7..592b370a 100644
--- a/tests/unit/utils/glmt-deprecation.test.ts
+++ b/tests/unit/utils/glmt-deprecation.test.ts
@@ -20,6 +20,9 @@ describe('glmt deprecation helpers', () => {
     expect(isLegacyGlmtBaseUrl('https://api.z.ai/api/coding/paas/v4/chat/completions/')).toBe(
       true
     );
+    expect(isLegacyGlmtBaseUrl('https://private.example.internal/v1/chat/completions')).toBe(
+      false
+    );
     expect(isLegacyGlmtBaseUrl('https://api.z.ai/api/anthropic')).toBe(false);
   });