diff --git a/tests/e2e/llm_translation/test_passthrough_headers_e2e.py b/tests/e2e/llm_translation/test_passthrough_headers_e2e.py
index 95d5d0c3f6a..d6f832afb53 100644
--- a/tests/e2e/llm_translation/test_passthrough_headers_e2e.py
+++ b/tests/e2e/llm_translation/test_passthrough_headers_e2e.py
@@ -128,6 +128,11 @@ def _messages_body() -> AnthropicMessagesBody:
 
 
 class TestPassthroughHeaders:
+    @pytest.mark.skip(
+        reason="stage red: ALB sends custom passthrough paths to backend pods, which lack ANTHROPIC_API_KEY, "
+        "so the os.environ header forwards unresolved and Anthropic 401s; routing user-defined paths to the "
+        "gateway needs a product/infra decision (fixed path namespace or dynamic ingress)"
+    )
     @pytest.mark.covers(
         "other.config.passthrough.headers_forwarded",
         exercised_on=[],