diff --git a/routstr/algorithm.py b/routstr/algorithm.py
index efd2a566..ccdc7088 100644
--- a/routstr/algorithm.py
+++ b/routstr/algorithm.py
@@ -153,9 +153,9 @@ def should_prefer_model(
     # Log provider changes when candidate wins
     if should_replace:
         candidate_provider_name = getattr(
-            candidate_provider, "upstream_name", "unknown"
+            candidate_provider, "provider_type", "unknown"
         )
-        current_provider_name = getattr(current_provider, "upstream_name", "unknown")
+        current_provider_name = getattr(current_provider, "provider_type", "unknown")
         logger.debug(
             f"Model selection for alias '{alias}': choosing {candidate_provider_name} "
             f"(cost: ${candidate_adjusted:.6f}) over {current_provider_name} "