diff --git a/litellm/constants.py b/litellm/constants.py
index ef06ce5111d3..88908462970c 100644
--- a/litellm/constants.py
+++ b/litellm/constants.py
@@ -1145,6 +1145,7 @@
     "anthropic.claude-sonnet-4-5-20250929-v1:0",
     "anthropic.claude-fable-5",
     "anthropic.claude-sonnet-5",
+    "anthropic.claude-sonnet-5-5",
     "anthropic.claude-opus-5",
     "anthropic.claude-opus-4-8",
     "anthropic.claude-opus-4-7",