diff --git a/litellm/types/llms/anthropic.py b/litellm/types/llms/anthropic.py
index 779a6950d92..0e687be660f 100644
--- a/litellm/types/llms/anthropic.py
+++ b/litellm/types/llms/anthropic.py
@@ -642,4 +642,8 @@ ANTHROPIC_TOOL_SEARCH_BETA_HEADER = "advanced-tool-use-2025-11-20"
 # Effort beta header constant
 ANTHROPIC_EFFORT_BETA_HEADER = "effort-2025-11-24"
 
+# OAuth constants
+ANTHROPIC_OAUTH_TOKEN_PREFIX = "sk-ant-oat"
+ANTHROPIC_OAUTH_BETA_HEADER = "oauth-2025-04-20"
+