diff --git a/policybench/paper_results.py b/policybench/paper_results.py
index 7f20b07..266fb29 100644
--- a/policybench/paper_results.py
+++ b/policybench/paper_results.py
@@ -682,11 +682,6 @@ def top_failure_subtypes(self, n: int = 3) -> str:
     "grok-4.3": "2026-04-17",
     # x.ai/news/grok-4-5; techcrunch.com 2026-07-08
     "grok-4.5": "2026-07-08",
-    # x.ai API listing; litellm model map (2026-08-12)
-    "grok-4.6": "2026-08-12",
-    # OpenRouter stealth listing date (no named maker); the board lists it as
-    # a labeled preview row dated by the listing.
-    "ox-alpha": "2026-08-21",
     # x.ai/news/grok-4-6 (2026-08-12)
     "grok-4.6": "2026-08-12",
     # API public beta per secondary trackers (bighatgroup.com xai-weekly