From ea10dd9d9e00a88705a6203ad3318a367f6c372e Mon Sep 17 00:00:00 2001
From: xzbdmw <97848247+xzbdmw@users.noreply.github.com>
Date: Fri, 20 Jun 2025 02:49:59 +0800
Subject: [PATCH] [Frontend] early return chat format resolution when specified
 (#19735)

---
 vllm/entrypoints/chat_utils.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/vllm/entrypoints/chat_utils.py b/vllm/entrypoints/chat_utils.py
index 95c806c228b82..7951c49f5da05 100644
--- a/vllm/entrypoints/chat_utils.py
+++ b/vllm/entrypoints/chat_utils.py
@@ -448,6 +448,9 @@ def resolve_chat_template_content_format(
     model_config: ModelConfig,
     trust_remote_code: Optional[bool] = None,
 ) -> _ChatTemplateContentFormat:
+    if given_format != "auto":
+        return given_format
+
     detected_format = _resolve_chat_template_content_format(
         chat_template,
         tools,
@@ -461,7 +464,7 @@ def resolve_chat_template_content_format(
         detected_format=detected_format,
     )
 
-    return detected_format if given_format == "auto" else given_format
+    return detected_format