diff --git a/litellm/proxy/vertex_ai_endpoints/google_ai_studio_endpoints.py b/litellm/proxy/vertex_ai_endpoints/google_ai_studio_endpoints.py
index c4a64fa21..29594a858 100644
--- a/litellm/proxy/vertex_ai_endpoints/google_ai_studio_endpoints.py
+++ b/litellm/proxy/vertex_ai_endpoints/google_ai_studio_endpoints.py
@@ -180,8 +180,11 @@ async def anthropic_proxy_route(
 
     ## check for streaming
     is_streaming_request = False
-    if "stream" in str(updated_url):
-        is_streaming_request = True
+    # anthropic is streaming when 'stream' = True is in the body
+    if request.method == "POST":
+        _request_body = await request.json()
+        if _request_body.get("stream"):
+            is_streaming_request = True
 
     ## CREATE PASS-THROUGH
     endpoint_func = create_pass_through_route(