From e24d1b24fe96a56ba8b0d653efa076d03eb95d6c Mon Sep 17 00:00:00 2001
From: Harry Mellor <19981378+hmellor@users.noreply.github.com>
Date: Thu, 2 Jul 2026 20:51:23 +0100
Subject: [PATCH] Fix Transformers modeling backend usage stats (#47472)

---
 vllm/v1/utils.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/vllm/v1/utils.py b/vllm/v1/utils.py
index 2ddd151980..b485d838f3 100644
--- a/vllm/v1/utils.py
+++ b/vllm/v1/utils.py
@@ -689,8 +689,15 @@ def report_usage_stats(
         else None
     )
 
+    if model_config.using_transformers_backend():
+        backend_cls = model_config._model_info.architecture
+        # Show what was wrapped e.g. TransformersForCausalLM(Starcoder2ForCausalLM)
+        architecture = f"{backend_cls}({model_config.architectures[0]})"
+    else:
+        architecture = get_architecture_class_name(model_config)
+
     usage_message.report_usage(
-        get_architecture_class_name(model_config),
+        architecture,
         usage_context,
         extra_kvs={
             # Common configuration